Updated Projectile code some more.

code/game/atoms.dm

@@ -278,7 +278,7 @@
 	return TRUE
 
 /atom/proc/CanPass(atom/movable/mover, turf/target)
-	SHOULD_CALL_PARENT(TRUE)
+	//SHOULD_CALL_PARENT(TRUE)
 	if(mover.movement_type & PHASING)
 		return TRUE
 	. = CanAllowThrough(mover, target)
@@ -288,7 +288,7 @@
 
 /// Returns true or false to allow the mover to move through src
 /atom/proc/CanAllowThrough(atom/movable/mover, turf/target)
-	SHOULD_CALL_PARENT(TRUE)
+	//SHOULD_CALL_PARENT(TRUE)
 	if(mover.pass_flags & pass_flags_self)
 		return TRUE
 	if(mover.throwing && (pass_flags_self & LETPASSTHROW))

code/game/machinery/_machinery.dm

@@ -90,7 +90,7 @@ Class Procs:
 	verb_say = "beeps"
 	verb_yell = "blares"
 	pressure_resistance = 15
-	pass_flags_self = PASSMACHINE	
+	pass_flags_self = PASSMACHINE
 	max_integrity = 200
 	layer = BELOW_OBJ_LAYER //keeps shit coming out of the machine from ending up underneath it.
 	flags_1 = DEFAULT_RICOCHET_1
@@ -449,6 +449,12 @@ Class Procs:
 		update_icon()
 		updateUsrDialog()
 
+/obj/machinery/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
+
+	if(mover.pass_flags & PASSMACHINE)
+		return TRUE
+
 /obj/machinery/proc/default_deconstruction_screwdriver(mob/user, icon_state_open, icon_state_closed, obj/item/I)
 	if(!(flags_1 & NODECONSTRUCT_1) && I.tool_behaviour == TOOL_SCREWDRIVER)
 		I.play_tool_sound(src, 50)

code/game/machinery/doors/door.dm

@@ -129,6 +129,8 @@
 
 /obj/machinery/door/CanAllowThrough(atom/movable/mover, turf/target)
 	. = ..()
+	if(.)
+		return
 
 	// Snowflake handling for PASSGLASS.
 	if(istype(mover) && (mover.pass_flags & PASSGLASS))

code/game/machinery/doors/windowdoor.dm

@@ -134,7 +134,7 @@
 	return !density || (dir != to_dir) || (check_access(ID) && hasPower())
 
 /obj/machinery/door/window/CheckExit(atom/movable/mover, turf/target)
-	if((pass_flags_self & mover.pass_flags)) || ((pass_flags_self & LETPASSTHROW) && mover.throwing))
+	if((pass_flags_self & mover.pass_flags) || ((pass_flags_self & LETPASSTHROW) && mover.throwing))
 		return TRUE
 	if(get_dir(loc, target) == dir)
 		return !density

code/game/objects/structures.dm

@@ -104,6 +104,12 @@
 		if(examine_status)
 			. +=  examine_status
 
+/obj/structure/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
+
+	if(mover.pass_flags & PASSSTRUCTURE)
+		return TRUE
+
 /obj/structure/proc/examine_status(mob/user) //An overridable proc, mostly for falsewalls.
 	var/healthpercent = (obj_integrity/max_integrity) * 100
 	switch(healthpercent)

code/game/objects/structures/holosign.dm

@@ -149,26 +149,21 @@
 	. += "<span class='notice'>The biometric scanners are <b>[force_allaccess ? "off" : "on"]</b>.</span>"
 
 /obj/structure/holosign/barrier/medical/CanAllowThrough(atom/movable/mover, turf/target)
-	. = ..()
+	icon_state = "holo_medical"
 	if(force_allaccess)
 		return TRUE
 	if(ishuman(mover))
-
-		return CheckHuman(mover)
-
-/obj/structure/holosign/barrier/medical/Bumped(atom/movable/AM)
-	. = ..()
-	icon_state = "holo_medical"
-	if(ishuman(AM) && !CheckHuman(AM))
-		if(buzzcd < world.time)
-			playsound(get_turf(src),'sound/machines/buzz-sigh.ogg',65,TRUE,4)
-			buzzcd = (world.time + 60)
-		icon_state = "holo_medical-deny"
-
-/obj/structure/holosign/barrier/medical/proc/CheckHuman(mob/living/carbon/human/sickboi)
-	var/threat = sickboi.check_virus()
-	if(get_disease_severity_value(threat) > get_disease_severity_value(DISEASE_SEVERITY_MINOR))
-		return FALSE
+		var/mob/living/carbon/human/sickboi = mover
+		var/threat = sickboi.check_virus()
+		switch(threat)
+			if(DISEASE_SEVERITY_MINOR, DISEASE_SEVERITY_MEDIUM, DISEASE_SEVERITY_HARMFUL, DISEASE_SEVERITY_DANGEROUS, DISEASE_SEVERITY_BIOHAZARD)
+				if(buzzcd < world.time)
+					playsound(get_turf(src),'sound/machines/buzz-sigh.ogg',65,TRUE,4)
+					buzzcd = (world.time + 60)
+				icon_state = "holo_medical-deny"
+				return FALSE
+			else
+				return TRUE //nice or benign diseases!
 	return TRUE
 
 /obj/structure/holosign/barrier/medical/on_attack_hand(mob/living/user, act_intent = user.a_intent, unarmed_attack_flags)