Impliments Ghom review, reverts blood list back to component

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

@@ -1,8 +1,7 @@
-
 /obj/effect/decal/cleanable
 	gender = PLURAL
 	layer = ABOVE_NORMAL_TURF_LAYER
-	var/list/random_icon_states = list()
+	var/list/random_icon_states = null
 	var/blood_state = "" //I'm sorry but cleanable/blood code is ass, and so is blood_DNA
 	var/bloodiness = 0 //0-100, amount of blood in this decal, used for making footprints and affecting the alpha of bloody footprints
 	var/mergeable_decal = TRUE //when two of these are on a same tile or do we need to merge them into just one?
@@ -26,9 +25,9 @@
 		if(LAZYLEN(diseases_to_add))
 			AddComponent(/datum/component/infective, diseases_to_add)
 
-/obj/effect/decal/cleanable/proc/replace_decal(obj/effect/decal/cleanable/C)
+/obj/effect/decal/cleanable/proc/replace_decal(obj/effect/decal/cleanable/C) // Returns true if we should give up in favor of the pre-existing decal
 	if(mergeable_decal)
-		qdel(C)
+		return TRUE
 
 /obj/effect/decal/cleanable/attackby(obj/item/W, mob/user, params)
 	if(istype(W, /obj/item/reagent_containers/glass) || istype(W, /obj/item/reagent_containers/food/drinks))
@@ -70,9 +69,10 @@
 //Add "bloodiness" of this blood's type, to the human's shoes
 //This is on /cleanable because fuck this ancient mess
 /obj/effect/decal/cleanable/Crossed(atom/movable/O)
+	..()
 	if(ishuman(O))
 		var/mob/living/carbon/human/H = O
-		if(H.shoes && blood_state && bloodiness && (!HAS_TRAIT(H,TRAIT_LIGHT_STEP) || !H.mind.assigned_role == "Detective"))
+		if(H.shoes && blood_state && bloodiness && !HAS_TRAIT(H, TRAIT_LIGHT_STEP))
 			var/obj/item/clothing/shoes/S = H.shoes
 			var/add_blood = 0
 			if(bloodiness >= BLOOD_GAIN_PER_STEP)
@@ -81,8 +81,7 @@
 				add_blood = bloodiness
 			bloodiness -= add_blood
 			S.bloody_shoes[blood_state] = min(MAX_SHOE_BLOODINESS,S.bloody_shoes[blood_state]+add_blood)
-			if(blood_DNA && blood_DNA.len)
-				S.add_blood(blood_DNA)
+			S.add_blood(return_blood_DNA())
 			S.blood_state = blood_state
 			update_icon()
 			H.update_inv_shoes()