Trace Chemicals and Mass Spectrometers (#11993)

code/modules/reagents/Chemistry-Reagents.dm

@@ -14,6 +14,7 @@
 	var/overdose = 0 // Volume of a chemical required in the blood to meet overdose criteria.
 	var/od_minimum_dose = 5 // Metabolised dose of a chemical required to meet overdose criteria.
 	var/scannable = 0 // Shows up on health analyzers.
+	var/spectro_hidden = FALSE // doesn't show up on basic mass spectrometers, only shows on the advanced variant
 	var/affects_dead = 0
 	var/glass_icon_state = null
 	var/glass_name = null
@@ -43,6 +44,12 @@
 
 /decl/reagent/proc/remove_self(var/amount, var/datum/reagents/holder) // Shortcut
 	holder.remove_reagent(type, amount) // Don't typecheck this, fix anywhere this is called with a null holder.
+	if(ishuman(holder.my_atom))
+		var/mob/living/carbon/human/H = holder.my_atom
+		if(H.vessel.reagent_data[/decl/reagent/blood]["trace_chem"][type])
+			H.vessel.reagent_data[/decl/reagent/blood]["trace_chem"][type] += amount
+		else
+			H.vessel.reagent_data[/decl/reagent/blood]["trace_chem"][type] = amount
 
 // This doesn't apply to skin contact - this is for, e.g. extinguishers and sprays. The difference is that reagent is not directly on the mob's skin - it might just be on their clothing.
 /decl/reagent/proc/touch_mob(var/mob/living/M, var/amount, var/datum/reagents/holder)

code/modules/reagents/Chemistry-Reagents/Chemistry-Reagents-Core.dm

@@ -12,13 +12,27 @@
 
 	fallback_specific_heat = 3.617
 
+/decl/reagent/blood/initialize_data(newdata, datum/reagents/holder)
+	. = ..()
+	if(.)
+		LAZYINITLIST(.["trace_chem"])
+
+/decl/reagent/blood/proc/handle_trace_chems(var/datum/reagents/holder)
+	var/list/trace_chems = holder.reagent_data[type]["trace_chem"]
+	for(var/chem in trace_chems)
+		var/decl/reagent/R = decls_repository.get_decl(chem)
+		trace_chems[chem] = trace_chems[chem] - (R.metabolism / 10) // work your way out of the body but at 10th the speed
+		if(trace_chems[chem] < 0)
+			trace_chems -= chem
+	holder.reagent_data[type]["trace_chem"] = trace_chems
+
 /decl/reagent/blood/mix_data(var/list/newdata, var/newamount, var/datum/reagents/holder)
 	var/list/data = ..()
 	if(LAZYACCESS(newdata, "trace_chem"))
 		var/list/other_chems = LAZYACCESS(newdata, "trace_chem")
 		if(!data)
 			data = newdata.Copy()
-		else if(!data["trace_chem"])
+		else if(!length(data["trace_chem"]))
 			data["trace_chem"] = other_chems.Copy()
 		else
 			var/list/my_chems = data["trace_chem"]

code/modules/reagents/Chemistry-Reagents/Chemistry-Reagents-Toxins.dm

@@ -254,6 +254,7 @@
 	description = "A strong neurotoxin that puts the subject into a death-like state."
 	reagent_state = SOLID
 	color = "#669900"
+	spectro_hidden = TRUE
 	metabolism = REM
 	strength = 3
 	taste_description = "death"
@@ -769,6 +770,7 @@
 	description = "A complicated to make and highly illegal drug that cause paralysis mostly focused on the limbs."
 	reagent_state = LIQUID
 	color = "#002067"
+	spectro_hidden = TRUE
 	metabolism = REM * 0.2
 	strength = 0
 	taste_description = "danger"