diff --git a/baystation12.dme b/baystation12.dme
index 915c098b3e..c394229a03 100644
--- a/baystation12.dme
+++ b/baystation12.dme
@@ -1267,10 +1267,15 @@
 #include "code\modules\nano\JSON Reader.dm"
 #include "code\modules\nano\JSON Writer.dm"
 #include "code\modules\nano\nanoexternal.dm"
-#include "code\modules\nano\nanointeraction.dm"
 #include "code\modules\nano\nanomanager.dm"
 #include "code\modules\nano\nanomapgen.dm"
 #include "code\modules\nano\nanoui.dm"
+#include "code\modules\nano\interaction\admin.dm"
+#include "code\modules\nano\interaction\base.dm"
+#include "code\modules\nano\interaction\contained.dm"
+#include "code\modules\nano\interaction\default.dm"
+#include "code\modules\nano\interaction\inventory.dm"
+#include "code\modules\nano\interaction\zlevel.dm"
 #include "code\modules\nano\modules\alarm_monitor.dm"
 #include "code\modules\nano\modules\crew_monitor.dm"
 #include "code\modules\nano\modules\human_appearance.dm"
diff --git a/code/game/antagonist/antagonist_build.dm b/code/game/antagonist/antagonist_build.dm
index 34631d36fb..40ba798aae 100644
--- a/code/game/antagonist/antagonist_build.dm
+++ b/code/game/antagonist/antagonist_build.dm
@@ -34,7 +34,7 @@
 	return 1
 
 	if(flags & ANTAG_SET_APPEARANCE)
-		player.change_appearance(APPEARANCE_ALL, player, player, valid_species)
+		player.change_appearance(APPEARANCE_ALL, player.loc, player, valid_species, state = z_state)
 
 /datum/antagonist/proc/unequip(var/mob/living/carbon/human/player)
 	if(!istype(player))
diff --git a/code/game/machinery/alarm.dm b/code/game/machinery/alarm.dm
index 9e3e56f558..f6d2820d5b 100644
--- a/code/game/machinery/alarm.dm
+++ b/code/game/machinery/alarm.dm
@@ -469,14 +469,14 @@
 	ui_interact(user)
 	wires.Interact(user)
 
-/obj/machinery/alarm/ui_interact(mob/user, ui_key = "main", datum/nanoui/ui = null, force_open = 1, var/master_ui = null, var/datum/topic_state/custom_state = null)
+/obj/machinery/alarm/ui_interact(mob/user, ui_key = "main", datum/nanoui/ui = null, force_open = 1, var/master_ui = null, var/datum/topic_state/state = default_state)
 	var/data[0]
 	var/remote_connection = 0
 	var/remote_access = 0
-	if(custom_state)
-		var/list/state = custom_state.href_list(user)
-		remote_connection = state["remote_connection"]	// Remote connection means we're non-adjacent/connecting from another computer
-		remote_access = state["remote_access"]			// Remote access means we also have the privilege to alter the air alarm.
+	if(state)
+		var/list/href = state.href_list(user)
+		remote_connection = href["remote_connection"]	// Remote connection means we're non-adjacent/connecting from another computer
+		remote_access = href["remote_access"]			// Remote access means we also have the privilege to alter the air alarm.
 
 	data["locked"] = locked && !user.isSilicon()
 	data["remote_connection"] = remote_connection
@@ -491,7 +491,7 @@
 
 	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if(!ui)
-		ui = new(user, src, ui_key, "air_alarm.tmpl", src.name, 325, 625, master_ui = master_ui, custom_state = custom_state)
+		ui = new(user, src, ui_key, "air_alarm.tmpl", src.name, 325, 625, master_ui = master_ui, state = state)
 		ui.set_initial_data(data)
 		ui.open()
 		ui.set_auto_update(1)
@@ -616,7 +616,7 @@
 
 			data["thresholds"] = thresholds
 
-/obj/machinery/alarm/CanUseTopic(var/mob/user, href_list, var/datum/topic_state/custom_state)
+/obj/machinery/alarm/CanUseTopic(var/mob/user, var/datum/topic_state/state, var/href_list = list())
 	if(buildstage != 2)
 		return STATUS_CLOSE
 
@@ -627,17 +627,15 @@
 	. = shorted ? STATUS_DISABLED : STATUS_INTERACTIVE
 
 	if(. == STATUS_INTERACTIVE)
-		var/extra_href = custom_state.href_list(usr)
-		// Prevent remote users from altering RCON settings unless they already have access (I realize the risks)
+		var/extra_href = state.href_list(usr)
+		// Prevent remote users from altering RCON settings unless they already have access
 		if(href_list["rcon"] && extra_href["remote_connection"] && !extra_href["remote_access"])
 			. = STATUS_UPDATE
 
-		//TODO: Move the rest of if(!locked || extra_href["remote_access"] || usr.isAI()) and hrefs here
-
 	return min(..(), .)
 
-/obj/machinery/alarm/Topic(href, href_list, var/nowindow = 0, var/datum/topic_state/custom_state)
-	if(..(href, href_list, nowindow, custom_state))
+/obj/machinery/alarm/Topic(href, href_list, var/nowindow = 0, var/datum/topic_state/state)
+	if(..(href, href_list, nowindow, state))
 		return 1
 
 	// hrefs that can always be called -walter0o
@@ -666,7 +664,7 @@
 		return 1
 
 	// hrefs that need the AA unlocked -walter0o
-	var/extra_href = custom_state.href_list(usr)
+	var/extra_href = state.href_list(usr)
 	if(!(locked && !extra_href["remote_connection"]) || extra_href["remote_access"] || usr.isSilicon())
 		if(href_list["command"])
 			var/device_id = href_list["id_tag"]
diff --git a/code/game/machinery/computer/atmos_alert.dm b/code/game/machinery/computer/atmos_alert.dm
index 8306b3a87e..77f7647608 100644
--- a/code/game/machinery/computer/atmos_alert.dm
+++ b/code/game/machinery/computer/atmos_alert.dm
@@ -13,7 +13,7 @@ var/global/list/minor_air_alarms = list()
 /obj/machinery/computer/atmos_alert/New()
 	..()
 	atmosphere_alarm.register(src, /obj/machinery/computer/station_alert/update_icon)
-    
+
 /obj/machinery/computer/atmos_alert/Del()
     atmosphere_alarm.unregister(src)
     ..()
@@ -68,16 +68,13 @@ var/global/list/minor_air_alarms = list()
 				var/obj/machinery/alarm/air_alarm = alarm_source.source
 				if(istype(air_alarm))
 					var/list/new_ref = list("atmos_reset" = 1)
-					air_alarm.Topic(href, new_ref, custom_state = atmos_alert_topic)
+					air_alarm.Topic(href, new_ref, state = air_alarm_topic)
 		return 1
 
 
-var/datum/topic_state/atmos_alert/atmos_alert_topic = new()
+var/datum/topic_state/air_alarm_topic/air_alarm_topic = new()
 
-/datum/topic_state/atmos_alert
-	flags = NANO_IGNORE_DISTANCE
-
-/datum/topic_state/air_alarm/href_list(var/mob/user)
+/datum/topic_state/air_alarm_topic/href_list(var/mob/user)
 	var/list/extra_href = list()
 	extra_href["remote_connection"] = 1
 	extra_href["remote_access"] = 1
diff --git a/code/game/machinery/computer/atmos_control.dm b/code/game/machinery/computer/atmos_control.dm
index d63259bc4c..2e79d927be 100644
--- a/code/game/machinery/computer/atmos_control.dm
+++ b/code/game/machinery/computer/atmos_control.dm
@@ -76,7 +76,7 @@
 			var/obj/machinery/alarm/alarm = locate(href_list["alarm"]) in (monitored_alarms ? monitored_alarms : machines)
 			if(alarm)
 				var/datum/topic_state/TS = generate_state(alarm)
-				alarm.ui_interact(usr, master_ui = ui_ref, custom_state = TS)
+				alarm.ui_interact(usr, master_ui = ui_ref, state = TS)
 		return 1
 
 /obj/machinery/computer/atmoscontrol/proc/generate_state(var/alarm)
@@ -86,7 +86,6 @@
 	return state
 
 /datum/topic_state/air_alarm
-	flags = NANO_IGNORE_DISTANCE
 	var/obj/machinery/computer/atmoscontrol/atmos_control = null
 	var/obj/machinery/alarm/air_alarm	= null
 
diff --git a/code/game/machinery/doors/airlock.dm b/code/game/machinery/doors/airlock.dm
index 40c137e77b..c275d8f728 100644
--- a/code/game/machinery/doors/airlock.dm
+++ b/code/game/machinery/doors/airlock.dm
@@ -610,7 +610,7 @@ About the new airlock wires panel:
 		..(user)
 	return
 
-/obj/machinery/door/airlock/CanUseTopic(var/mob/user, href_list)
+/obj/machinery/door/airlock/CanUseTopic(var/mob/user)
 	if(!user.isSilicon())
 		return STATUS_CLOSE
 
diff --git a/code/game/machinery/machinery.dm b/code/game/machinery/machinery.dm
index c573229a10..d601146c18 100644
--- a/code/game/machinery/machinery.dm
+++ b/code/game/machinery/machinery.dm
@@ -185,7 +185,7 @@ Class Procs:
 /obj/machinery/proc/inoperable(var/additional_flags = 0)
 	return (stat & (NOPOWER|BROKEN|additional_flags))
 
-/obj/machinery/CanUseTopic(var/mob/user, var/be_close)
+/obj/machinery/CanUseTopic(var/mob/user)
 	if(!interact_offline && (stat & (NOPOWER|BROKEN)))
 		return STATUS_CLOSE
 
diff --git a/code/game/objects/items/devices/PDA/PDA.dm b/code/game/objects/items/devices/PDA/PDA.dm
index 87f7b0fd8a..fe9305646a 100755
--- a/code/game/objects/items/devices/PDA/PDA.dm
+++ b/code/game/objects/items/devices/PDA/PDA.dm
@@ -542,7 +542,7 @@ var/global/list/obj/item/device/pda/PDAs = list()
 	if (!ui)
 		// the ui does not exist, so we'll create a new() one
 	        // for a list of parameters and their descriptions see the code docs in \code\modules\nano\nanoui.dm
-		ui = new(user, src, ui_key, "pda.tmpl", title, 520, 400)
+		ui = new(user, src, ui_key, "pda.tmpl", title, 520, 400, state = inventory_state)
 		// when the ui is first opened this is the data it will use
 
 		ui.load_cached_data(ManifestJSON)
diff --git a/code/game/objects/items/devices/uplinks.dm b/code/game/objects/items/devices/uplinks.dm
index b2ac742a7c..57b569c599 100644
--- a/code/game/objects/items/devices/uplinks.dm
+++ b/code/game/objects/items/devices/uplinks.dm
@@ -53,6 +53,9 @@ datum/nano_item_lists
 	var/uplink_owner = null//text-only
 	var/used_TC = 0
 
+/obj/item/device/uplink/nano_host()
+	return loc
+
 /obj/item/device/uplink/New()
 	..()
 	welcome = ticker.mode.uplink_welcome
@@ -219,7 +222,7 @@ datum/nano_item_lists
 	if (!ui)
 		// the ui does not exist, so we'll create a new() one
         // for a list of parameters and their descriptions see the code docs in \code\modules\nano\nanoui.dm
-		ui = new(user, src, ui_key, "uplink.tmpl", title, 450, 600)
+		ui = new(user, src, ui_key, "uplink.tmpl", title, 450, 600, state = inventory_state)
 		// when the ui is first opened this is the data it will use
 		ui.set_initial_data(data)
 		// open the new ui window
diff --git a/code/game/objects/objs.dm b/code/game/objects/objs.dm
index 51cb54ea2d..39b767263f 100644
--- a/code/game/objects/objs.dm
+++ b/code/game/objects/objs.dm
@@ -16,15 +16,14 @@
 	var/damtype = "brute"
 	var/force = 0
 
-/obj/Topic(href, href_list, var/nowindow = 0, var/datum/topic_state/custom_state = default_state)
+/obj/Topic(href, href_list, var/nowindow = 0, var/datum/topic_state/state = default_state)
 	// Calling Topic without a corresponding window open causes runtime errors
 	if(!nowindow && ..())
 		return 1
 
 	// In the far future no checks are made in an overriding Topic() beyond if(..()) return
 	// Instead any such checks are made in CanUseTopic()
-	var/obj/host = nano_host()
-	if(host.CanUseTopic(usr, href_list, custom_state) == STATUS_INTERACTIVE)
+	if(CanUseTopic(usr, state, href_list) == STATUS_INTERACTIVE)
 		CouldUseTopic(usr)
 		return 0
 
diff --git a/code/modules/admin/admin_verbs.dm b/code/modules/admin/admin_verbs.dm
index 59e40e2a44..5a006c2718 100644
--- a/code/modules/admin/admin_verbs.dm
+++ b/code/modules/admin/admin_verbs.dm
@@ -724,7 +724,8 @@ var/list/admin_verbs_mentor = list(
 		return
 
 	if(holder)
-		S.subsystem_law_manager()
+		var/obj/nano_module/law_manager/L = new(S)
+		L.ui_interact(usr, state = admin_state)
 	admin_log_and_message_admins("has opened [S]'s law manager.")
 	feedback_add_details("admin_verb","MSL") //If you are copy-pasting this, ensure the 2nd parameter is unique to the new proc!
 
@@ -738,7 +739,7 @@ var/list/admin_verbs_mentor = list(
 
 	if(holder)
 		admin_log_and_message_admins("is altering the appearance of [H].")
-		H.change_appearance(APPEARANCE_ALL, usr, usr, check_species_whitelist = 0)
+		H.change_appearance(APPEARANCE_ALL, usr, usr, check_species_whitelist = 0, state = admin_state)
 	feedback_add_details("admin_verb","CHAA") //If you are copy-pasting this, ensure the 2nd parameter is unique to the new proc!
 
 /client/proc/change_human_appearance_self(mob/living/carbon/human/H in mob_list)
diff --git a/code/modules/clothing/spacesuits/rig/rig.dm b/code/modules/clothing/spacesuits/rig/rig.dm
index 4c8da1665a..529d9aee82 100644
--- a/code/modules/clothing/spacesuits/rig/rig.dm
+++ b/code/modules/clothing/spacesuits/rig/rig.dm
@@ -459,7 +459,7 @@
 
 	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if (!ui)
-		ui = new(user, src, ui_key, ((src.loc != user) ? ai_interface_path : interface_path), interface_title, 480, 550)
+		ui = new(user, src, ui_key, ((src.loc != user) ? ai_interface_path : interface_path), interface_title, 480, 550, data["ai"] ? contained_state : inventory_state)
 		ui.set_initial_data(data)
 		ui.open()
 		ui.set_auto_update(1)
diff --git a/code/modules/mob/living/carbon/human/appearance.dm b/code/modules/mob/living/carbon/human/appearance.dm
index e2ef586f05..52ba116d43 100644
--- a/code/modules/mob/living/carbon/human/appearance.dm
+++ b/code/modules/mob/living/carbon/human/appearance.dm
@@ -1,7 +1,7 @@
-/mob/living/carbon/human/proc/change_appearance(var/flags = APPEARANCE_ALL_HAIR, var/location = src, var/mob/user = src, var/check_species_whitelist = 1, var/list/species_whitelist = list(), var/list/species_blacklist = list())
+/mob/living/carbon/human/proc/change_appearance(var/flags = APPEARANCE_ALL_HAIR, var/location = src, var/mob/user = src, var/check_species_whitelist = 1, var/list/species_whitelist = list(), var/list/species_blacklist = list(), var/datum/topic_state/state = default_state)
 	var/obj/nano_module/appearance_changer/AC = new(location, src, check_species_whitelist, species_whitelist, species_blacklist)
 	AC.flags = flags
-	AC.ui_interact(user)
+	AC.ui_interact(user, state = state)
 
 /mob/living/carbon/human/proc/change_species(var/new_species)
 	if(!new_species)
diff --git a/code/modules/nano/interaction/admin.dm b/code/modules/nano/interaction/admin.dm
new file mode 100644
index 0000000000..59de0ce22e
--- /dev/null
+++ b/code/modules/nano/interaction/admin.dm
@@ -0,0 +1,7 @@
+/*
+	This state checks that the user is an admin, end of story
+*/
+/var/global/datum/topic_state/admin_state/admin_state = new()
+
+/datum/topic_state/admin_state/can_use_topic(var/src_object, var/mob/user)
+	return check_rights(R_ADMIN, 0, user) ? STATUS_INTERACTIVE : STATUS_CLOSE
diff --git a/code/modules/nano/interaction/base.dm b/code/modules/nano/interaction/base.dm
new file mode 100644
index 0000000000..46b11278d6
--- /dev/null
+++ b/code/modules/nano/interaction/base.dm
@@ -0,0 +1,19 @@
+/atom/proc/nano_host()
+	return src
+
+/atom/proc/CanUseTopic(var/mob/user, var/datum/topic_state/state)
+	var/src_object = nano_host()
+	return state.can_use_topic(src_object, user)
+
+/datum/topic_state/proc/href_list(var/mob/user)
+	return list()
+
+/datum/topic_state/proc/can_use_topic(var/src_object, var/mob/user)
+	return STATUS_INTERACTIVE
+
+/mob/proc/shared_nano_interaction()
+	if (src.stat || !client)
+		return STATUS_CLOSE						// no updates, close the interface
+	else if (restrained() || lying || stat || stunned || weakened)
+		return STATUS_UPDATE					// update only (orange visibility)
+	return STATUS_INTERACTIVE
diff --git a/code/modules/nano/interaction/contained.dm b/code/modules/nano/interaction/contained.dm
new file mode 100644
index 0000000000..c9ecba15be
--- /dev/null
+++ b/code/modules/nano/interaction/contained.dm
@@ -0,0 +1,18 @@
+/*
+	This state checks if user is somewhere within src_object, as well as the default NanoUI interaction.
+*/
+/var/global/datum/topic_state/contained_state/contained_state = new()
+
+/datum/topic_state/contained_state/can_use_topic(var/atom/src_object, var/mob/user)
+	if(!src_object.contains(src))
+		return STATUS_CLOSE
+
+	return user.shared_nano_interaction()
+
+/atom/proc/contains(var/atom/location)
+	if(!location)
+		return 0
+	if(location == src)
+		return 1
+
+	return contains(location.loc)
diff --git a/code/modules/nano/nanointeraction.dm b/code/modules/nano/interaction/default.dm
similarity index 63%
rename from code/modules/nano/nanointeraction.dm
rename to code/modules/nano/interaction/default.dm
index d929cfe2b5..7135d876bc 100644
--- a/code/modules/nano/nanointeraction.dm
+++ b/code/modules/nano/interaction/default.dm
@@ -1,41 +1,36 @@
-/atom/proc/nano_host()
-	return src
+/var/global/datum/topic_state/default_state = new()
 
-/obj/nano_module/nano_host()
-	return loc
+/datum/topic_state/default/href_list(var/mob/user)
+	return list()
 
+/datum/topic_state/default/can_use_topic(var/src_object, var/mob/user)
+	return user.default_can_use_topic(src_object)
 
-/atom/proc/CanUseTopic(var/mob/user, href_list, var/datum/topic_state/custom_state)
-	return user.can_use_topic(nano_host(), custom_state)
-
-
-/mob/proc/can_use_topic(var/mob/user, var/datum/topic_state/custom_state)
+/mob/proc/default_can_use_topic(var/src_object)
 	return STATUS_CLOSE // By default no mob can do anything with NanoUI
 
-/mob/dead/observer/can_use_topic()
+/mob/dead/observer/default_can_use_topic()
 	if(check_rights(R_ADMIN, 0, src))
 		return STATUS_INTERACTIVE				// Admins are more equal
 	return STATUS_UPDATE						// Ghosts can view updates
 
-/mob/living/silicon/pai/can_use_topic(var/src_object)
+/mob/living/silicon/pai/default_can_use_topic(var/src_object)
 	if(src_object == src && !stat)
 		return STATUS_INTERACTIVE
 	else
 		return ..()
 
-/mob/living/silicon/robot/can_use_topic(var/src_object, var/datum/topic_state/custom_state)
+/mob/living/silicon/robot/default_can_use_topic(var/src_object)
 	if(stat || !client)
 		return STATUS_CLOSE
 	if(lockcharge || stunned || weakened)
 		return STATUS_DISABLED
-	if(custom_state.flags & NANO_IGNORE_DISTANCE)
-		return STATUS_INTERACTIVE
 	// robots can interact with things they can see within their view range
 	if((src_object in view(src)) && get_dist(src_object, src) <= src.client.view)
 		return STATUS_INTERACTIVE	// interactive (green visibility)
 	return STATUS_DISABLED			// no updates, completely disabled (red visibility)
 
-/mob/living/silicon/robot/syndicate/can_use_topic(var/src_object)
+/mob/living/silicon/robot/syndicate/default_can_use_topic(var/src_object)
 	. = ..()
 	if(. != STATUS_INTERACTIVE)
 		return
@@ -50,7 +45,7 @@
 			return STATUS_INTERACTIVE
 	return STATUS_UPDATE
 
-/mob/living/silicon/ai/can_use_topic(var/src_object)
+/mob/living/silicon/ai/default_can_use_topic(var/src_object)
 	if(!client || check_unable(1))
 		return STATUS_CLOSE
 	// Prevents the AI from using Topic on admin levels (by for example viewing through the court/thunderdome cameras)
@@ -71,26 +66,13 @@
 			return apc_override ? STATUS_INTERACTIVE : STATUS_CLOSE
 		return STATUS_INTERACTIVE
 
-	return 	STATUS_CLOSE
-
-/mob/living/proc/shared_living_nano_interaction(var/src_object)
-	if (src.stat != CONSCIOUS)
-		return STATUS_CLOSE						// no updates, close the interface
-	else if (restrained() || lying || stat || stunned || weakened)
-		return STATUS_UPDATE					// update only (orange visibility)
-	return STATUS_INTERACTIVE
+	return STATUS_CLOSE
 
 //Some atoms such as vehicles might have special rules for how mobs inside them interact with NanoUI.
 /atom/proc/contents_nano_distance(var/src_object, var/mob/living/user)
 	return user.shared_living_nano_distance(src_object)
 
 /mob/living/proc/shared_living_nano_distance(var/atom/movable/src_object)
-	if(!isturf(src_object.loc))
-		if(src_object.loc == src)				// Item in the inventory
-			return STATUS_INTERACTIVE
-		if(src.contents.Find(src_object.loc))	// A hidden uplink inside an item
-			return STATUS_INTERACTIVE
-
 	if (!(src_object in view(4, src))) 	// If the src object is not in visable, disable updates
 		return STATUS_CLOSE
 
@@ -103,27 +85,17 @@
 		return STATUS_DISABLED 		// no updates, completely disabled (red visibility)
 	return STATUS_CLOSE
 
-/mob/living/can_use_topic(var/src_object, var/datum/topic_state/custom_state)
-	. = shared_living_nano_interaction(src_object)
-	if(. == STATUS_INTERACTIVE && !(custom_state.flags & NANO_IGNORE_DISTANCE))
+/mob/living/default_can_use_topic(var/src_object)
+	. = shared_nano_interaction(src_object)
+	if(. == STATUS_INTERACTIVE)
 		if(loc)
 			. = loc.contents_nano_distance(src_object, src)
-		else
-			. = shared_living_nano_distance(src_object)
 	if(STATUS_INTERACTIVE)
 		return STATUS_UPDATE
 
-/mob/living/carbon/human/can_use_topic(var/src_object, var/datum/topic_state/custom_state)
-	. = shared_living_nano_interaction(src_object)
-	if(. == STATUS_INTERACTIVE && !(custom_state.flags & NANO_IGNORE_DISTANCE))
+/mob/living/carbon/human/default_can_use_topic(var/src_object)
+	. = shared_nano_interaction(src_object)
+	if(. == STATUS_INTERACTIVE)
 		. = shared_living_nano_distance(src_object)
 		if(. == STATUS_UPDATE && (TK in mutations))	// If we have telekinesis and remain close enough, allow interaction.
 			return STATUS_INTERACTIVE
-
-/var/global/datum/topic_state/default_state = new()
-
-/datum/topic_state
-	var/flags = 0
-
-/datum/topic_state/proc/href_list(var/mob/user)
-	return list()
\ No newline at end of file
diff --git a/code/modules/nano/interaction/inventory.dm b/code/modules/nano/interaction/inventory.dm
new file mode 100644
index 0000000000..9bbd7c7ecb
--- /dev/null
+++ b/code/modules/nano/interaction/inventory.dm
@@ -0,0 +1,10 @@
+/*
+	This state checks that the src_object is somewhere in the user's first-level inventory (in hands, on ear, etc.), but not further down (such as in bags).
+*/
+/var/global/datum/topic_state/inventory_state/inventory_state = new()
+
+/datum/topic_state/inventory_state/can_use_topic(var/src_object, var/mob/user)
+	if(!(src_object in src))
+		return STATUS_CLOSE
+
+	return user.shared_nano_interaction()
diff --git a/code/modules/nano/interaction/zlevel.dm b/code/modules/nano/interaction/zlevel.dm
new file mode 100644
index 0000000000..80d4c2e601
--- /dev/null
+++ b/code/modules/nano/interaction/zlevel.dm
@@ -0,0 +1,13 @@
+/*
+	This state checks that the user is on the same Z-level as src_object
+*/
+
+/var/global/datum/topic_state/z_state/z_state = new()
+
+/datum/topic_state/z_state/can_use_topic(var/src_object, var/mob/user)
+	var/turf/turf_obj = get_turf(src_object)
+	var/turf/turf_usr = get_turf(user)
+	if(!turf_obj || !turf_usr)
+		return STATUS_CLOSE
+
+	return turf_obj.z == turf_usr.z ? STATUS_INTERACTIVE : STATUS_CLOSE
diff --git a/code/modules/nano/modules/human_appearance.dm b/code/modules/nano/modules/human_appearance.dm
index be2259d618..47324c47b0 100644
--- a/code/modules/nano/modules/human_appearance.dm
+++ b/code/modules/nano/modules/human_appearance.dm
@@ -18,7 +18,7 @@
 	src.whitelist = species_whitelist
 	src.blacklist = species_blacklist
 
-/obj/nano_module/appearance_changer/Topic(ref, href_list)
+/obj/nano_module/appearance_changer/Topic(ref, href_list, var/nowindow, var/datum/topic_state/state = default_state)
 	if(..())
 		return 1
 
@@ -35,13 +35,13 @@
 	if(href_list["skin_tone"])
 		if(can_change_skin_tone())
 			var/new_s_tone = input(usr, "Choose your character's skin-tone:\n(Light 1 - 220 Dark)", "Skin Tone", owner.s_tone) as num|null
-			if(isnum(new_s_tone) && CanUseTopic(usr) == STATUS_INTERACTIVE)
+			if(isnum(new_s_tone) && can_still_topic(state))
 				new_s_tone = 35 - max(min( round(new_s_tone), 220),1)
 				return owner.change_skin_tone(new_s_tone)
 	if(href_list["skin_color"])
 		if(can_change_skin_color())
 			var/new_skin = input(usr, "Choose your character's skin colour: ", "Skin Color", rgb(owner.r_skin, owner.g_skin, owner.b_skin)) as color|null
-			if(new_skin && can_still_topic())
+			if(new_skin && can_still_topic(state))
 				var/r_skin = hex2num(copytext(new_skin, 2, 4))
 				var/g_skin = hex2num(copytext(new_skin, 4, 6))
 				var/b_skin = hex2num(copytext(new_skin, 6, 8))
@@ -56,7 +56,7 @@
 	if(href_list["hair_color"])
 		if(can_change(APPEARANCE_HAIR_COLOR))
 			var/new_hair = input("Please select hair color.", "Hair Color", rgb(owner.r_hair, owner.g_hair, owner.b_hair)) as color|null
-			if(new_hair && can_still_topic())
+			if(new_hair && can_still_topic(state))
 				var/r_hair = hex2num(copytext(new_hair, 2, 4))
 				var/g_hair = hex2num(copytext(new_hair, 4, 6))
 				var/b_hair = hex2num(copytext(new_hair, 6, 8))
@@ -71,7 +71,7 @@
 	if(href_list["facial_hair_color"])
 		if(can_change(APPEARANCE_FACIAL_HAIR_COLOR))
 			var/new_facial = input("Please select facial hair color.", "Facial Hair Color", rgb(owner.r_facial, owner.g_facial, owner.b_facial)) as color|null
-			if(new_facial && can_still_topic())
+			if(new_facial && can_still_topic(state))
 				var/r_facial = hex2num(copytext(new_facial, 2, 4))
 				var/g_facial = hex2num(copytext(new_facial, 4, 6))
 				var/b_facial = hex2num(copytext(new_facial, 6, 8))
@@ -81,7 +81,7 @@
 	if(href_list["eye_color"])
 		if(can_change(APPEARANCE_EYE_COLOR))
 			var/new_eyes = input("Please select eye color.", "Eye Color", rgb(owner.r_eyes, owner.g_eyes, owner.b_eyes)) as color|null
-			if(new_eyes && can_still_topic())
+			if(new_eyes && can_still_topic(state))
 				var/r_eyes = hex2num(copytext(new_eyes, 2, 4))
 				var/g_eyes = hex2num(copytext(new_eyes, 4, 6))
 				var/b_eyes = hex2num(copytext(new_eyes, 6, 8))
@@ -91,7 +91,7 @@
 
 	return 0
 
-/obj/nano_module/appearance_changer/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1)
+/obj/nano_module/appearance_changer/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1, var/datum/topic_state/state = default_state)
 	generate_data(check_whitelist, whitelist, blacklist)
 	var/data[0]
 
@@ -128,7 +128,7 @@
 	data["change_facial_hair_color"] = can_change(APPEARANCE_FACIAL_HAIR_COLOR)
 	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if (!ui)
-		ui = new(user, src, ui_key, "appearance_changer.tmpl", "[src.name]", 800, 450)
+		ui = new(user, src, ui_key, "appearance_changer.tmpl", "[src.name]", 800, 450, state = state)
 		ui.set_initial_data(data)
 		ui.open()
 		ui.set_auto_update(1)
diff --git a/code/modules/nano/modules/law_manager.dm b/code/modules/nano/modules/law_manager.dm
index 4f81585a04..7cdd93b4dc 100644
--- a/code/modules/nano/modules/law_manager.dm
+++ b/code/modules/nano/modules/law_manager.dm
@@ -152,7 +152,7 @@
 
 	return 0
 
-/obj/nano_module/law_manager/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1)
+/obj/nano_module/law_manager/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1, var/datum/topic_state/state = default_state)
 	var/data[0]
 	owner.lawsync()
 
@@ -189,7 +189,7 @@
 
 	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if (!ui)
-		ui = new(user, src, ui_key, "law_manager.tmpl", sanitize("[src] - [owner]"), 800, is_malf(user) ? 600 : 400)
+		ui = new(user, src, ui_key, "law_manager.tmpl", sanitize("[src] - [owner]"), 800, is_malf(user) ? 600 : 400, state = state)
 		ui.set_initial_data(data)
 		ui.open()
 		ui.set_auto_update(1)
diff --git a/code/modules/nano/modules/nano_module.dm b/code/modules/nano/modules/nano_module.dm
index 3787639c9d..3fa8275099 100644
--- a/code/modules/nano/modules/nano_module.dm
+++ b/code/modules/nano/modules/nano_module.dm
@@ -1,2 +1,5 @@
-/obj/nano_module/proc/can_still_topic()
-	return CanUseTopic(usr, list(), default_state) == STATUS_INTERACTIVE
+/obj/nano_module/nano_host()
+	return loc
+
+/obj/nano_module/proc/can_still_topic(var/datum/topic_state/state = default_state)
+	return CanUseTopic(usr, state) == STATUS_INTERACTIVE
diff --git a/code/modules/nano/nanoexternal.dm b/code/modules/nano/nanoexternal.dm
index b029019f1a..bb283accf5 100644
--- a/code/modules/nano/nanoexternal.dm
+++ b/code/modules/nano/nanoexternal.dm
@@ -37,7 +37,7 @@
   *
   * @return nothing
   */
-/atom/movable/proc/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1, var/datum/nano_ui/master_ui = null, var/datum/topic_state/custom_state = null)
+/atom/movable/proc/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1, var/datum/nano_ui/master_ui = null, var/datum/topic_state/state = default_state)
 	return
 
 // Used by the Nano UI Manager (/datum/nanomanager) to track UIs opened by this mob
diff --git a/code/modules/nano/nanoui.dm b/code/modules/nano/nanoui.dm
index 2c86343515..ffc6208f39 100644
--- a/code/modules/nano/nanoui.dm
+++ b/code/modules/nano/nanoui.dm
@@ -55,7 +55,7 @@ nanoui is used to open and update nano browser uis
 	// Relationship between a master interface and its children. Used in update_status
 	var/datum/nanoui/master_ui
 	var/list/datum/nanoui/children = list()
-	var/datum/topic_state/custom_state = null
+	var/datum/topic_state/state = null
 
 	var/cached_data = null
 
@@ -73,7 +73,7 @@ nanoui is used to open and update nano browser uis
   *
   * @return /nanoui new nanoui object
   */
-/datum/nanoui/New(nuser, nsrc_object, nui_key, ntemplate_filename, ntitle = 0, nwidth = 0, nheight = 0, var/atom/nref = null, var/datum/nanoui/master_ui = null, var/datum/topic_state/custom_state = default_state)
+/datum/nanoui/New(nuser, nsrc_object, nui_key, ntemplate_filename, ntitle = 0, nwidth = 0, nheight = 0, var/atom/nref = null, var/datum/nanoui/master_ui = null, var/datum/topic_state/state = default_state)
 	user = nuser
 	src_object = nsrc_object
 	ui_key = nui_key
@@ -82,7 +82,7 @@ nanoui is used to open and update nano browser uis
 	src.master_ui = master_ui
 	if(master_ui)
 		master_ui.children += src
-	src.custom_state = custom_state
+	src.state = state
 
 	// add the passed template filename as the "main" template, this is required
 	add_template("main", ntemplate_filename)
@@ -142,8 +142,7 @@ nanoui is used to open and update nano browser uis
   * @return nothing
   */
 /datum/nanoui/proc/update_status(var/push_update = 0)
-	var/atom/movable/host = src_object.nano_host()
-	var/new_status = host.CanUseTopic(user, list(), custom_state)
+	var/new_status = src_object.CanUseTopic(user, state)
 	if(master_ui)
 		new_status = min(new_status, master_ui.status)
 
@@ -483,7 +482,7 @@ nanoui is used to open and update nano browser uis
 		set_map_z_level(text2num(href_list["mapZLevel"]))
 		map_update = 1
 
-	if ((src_object && src_object.Topic(href, href_list, 0, custom_state)) || map_update)
+	if ((src_object && src_object.Topic(href, href_list, 0, state)) || map_update)
 		nanomanager.update_uis(src_object) // update all UIs attached to src_object
 
  /**
@@ -510,4 +509,4 @@ nanoui is used to open and update nano browser uis
   * @return nothing
   */
 /datum/nanoui/proc/update(var/force_open = 0)
-	src_object.ui_interact(user, ui_key, src, force_open, master_ui, custom_state)
+	src_object.ui_interact(user, ui_key, src, force_open, master_ui, state)
diff --git a/code/setup.dm b/code/setup.dm
index 127c33f89f..514cf1e5ee 100644
--- a/code/setup.dm
+++ b/code/setup.dm
@@ -779,8 +779,6 @@ var/list/be_special_flags = list(
 //General-purpose life speed define for plants.
 #define HYDRO_SPEED_MULTIPLIER 1
 
-#define NANO_IGNORE_DISTANCE 1
-
 // Robot AI notifications
 #define ROBOT_NOTIFICATION_NEW_UNIT 1
 #define ROBOT_NOTIFICATION_NEW_NAME 2