Forensics re-destroyed, but better this time.

All lists are LAZYINITLIST, cleaning code is preserved, examine is preserved. We should be back in buisness, but this is just a 'holy fuck finally' commit

code/game/objects/effects/decals/cleanable.dm

@@ -81,7 +81,8 @@
 				add_blood = bloodiness
 			bloodiness -= add_blood
 			S.bloody_shoes[blood_state] = min(MAX_SHOE_BLOODINESS,S.bloody_shoes[blood_state]+add_blood)
-			S.add_blood_DNA(return_blood_DNA())
+			if(blood_DNA && blood_DNA.len)
+				S.add_blood_DNA(blood_DNA)
 			S.blood_state = blood_state
 			update_icon()
 			H.update_inv_shoes()

code/game/objects/effects/decals/cleanable/aliens.dm

@@ -35,7 +35,7 @@
 			if(infective)
 				diseases = infective.diseases
 			var/obj/effect/decal/cleanable/blood/splatter/xeno/splat = new /obj/effect/decal/cleanable/blood/splatter/xeno(loc, diseases)
-			splat.add_blood_DNA(return_blood_DNA())
+			splat.transfer_blood_dna(blood_DNA)
 		if(!step_to(src, get_step(src, direction), 0))
 			break
 

code/game/objects/effects/decals/cleanable/gibs.dm

@@ -21,9 +21,6 @@
 
 
 /obj/effect/decal/cleanable/blood/gibs/update_icon()
-	GET_COMPONENT(D, /datum/component/forensics)
-	if(D)
-		Blood_DNA = D.blood_DNA
 	add_atom_colour(blood_DNA_to_color(), FIXED_COLOUR_PRIORITY)
 	cut_overlays()
 	var/mutable_appearance/guts = mutable_appearance(icon, "[icon_state]_guts")
@@ -60,7 +57,7 @@
 			if(infective)
 				diseases = infective.diseases
 			var/obj/effect/decal/cleanable/blood/splatter/splat = new /obj/effect/decal/cleanable/blood/splatter(loc, diseases)
-			splat.add_blood_DNA(return_blood_DNA())
+			splat.transfer_blood_dna(blood_DNA)
 
 		if(!step_to(src, get_step(src, direction), 0))
 			break

code/game/objects/effects/decals/cleanable/humans.dm

@@ -7,12 +7,10 @@
 	blood_state = BLOOD_STATE_BLOOD
 	bloodiness = MAX_SHOE_BLOODINESS
 	color = BLOOD_COLOR_HUMAN //default so we don't have white splotches everywhere.
-	var/list/Blood_DNA = list()
 
 /obj/effect/decal/cleanable/blood/replace_decal(obj/effect/decal/cleanable/blood/C)
-	C.add_blood_DNA(return_blood_DNA())
-	if(C.Blood_DNA.len)
-		Blood_DNA |= C.Blood_DNA.Copy()
+	if (C.blood_DNA)
+		blood_DNA |= C.blood_DNA.Copy()
 	if (bloodiness)
 		if (C.bloodiness < MAX_SHOE_BLOODINESS)
 			C.bloodiness += bloodiness
@@ -28,9 +26,6 @@
 	update_icon()
 
 /obj/effect/decal/cleanable/blood/update_icon()
-	GET_COMPONENT(D, /datum/component/forensics)
-	if(D)
-		Blood_DNA = D.blood_DNA
 	color = blood_DNA_to_color()
 
 /obj/effect/decal/cleanable/blood/old

code/game/objects/items/stacks/stack.dm

@@ -389,9 +389,9 @@
 		. = ..()
 
 /obj/item/stack/proc/copy_evidences(obj/item/stack/from)
-	add_blood_DNA(from.return_blood_DNA())
-	add_fingerprint_list(from.return_fingerprints())
-	add_hiddenprint_list(from.return_hiddenprints())
+	blood_DNA = from.blood_DNA
+	fingerprints  = from.fingerprints
+	fingerprintshidden  = from.fingerprintshidden
 	fingerprintslast  = from.fingerprintslast
 	//TODO bloody overlay