REEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

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

@@ -82,7 +82,7 @@
 				add_blood = bloodiness
 			bloodiness -= add_blood
 			S.bloody_shoes[blood_state] = min(MAX_SHOE_BLOODINESS,S.bloody_shoes[blood_state]+add_blood)
-			if(length(blood_DNA))
+			if(blood_DNA && blood_DNA.len)
 				S.add_blood_DNA(blood_DNA)
 			S.blood_state = blood_state
 			update_icon()

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

@@ -9,13 +9,10 @@
 	color = BLOOD_COLOR_HUMAN //default so we don't have white splotches everywhere.
 
 /obj/effect/decal/cleanable/blood/replace_decal(obj/effect/decal/cleanable/blood/C)
-	if(length(C.blood_DNA))
+	if (C.blood_DNA)
 		blood_DNA |= C.blood_DNA.Copy()
-	if (bloodiness)
-		if (C.bloodiness < MAX_SHOE_BLOODINESS)
-			C.bloodiness += bloodiness
 	update_icon()
-	return ..()
+	..()
 
 /obj/effect/decal/cleanable/blood/transfer_blood_dna()
 	..()