Makes retrieval implants handle lockers

yogstation/code/game/objects/items/implants/implant_teleporter.dm

@@ -17,35 +17,36 @@
 		useblacklist = FALSE
 
 	if(imp_in)
-		if(!is_centcom_level(imp_in.z)) //teleporting doesn't work on centcom
+		var/turf/T = get_turf_global(imp_in)
+		if(!is_centcom_level(T.z)) //teleporting doesn't work on centcom
 
 			if(blacklist.len && useblacklist)
 				var/i = 0
 				for(var/zlevel in blacklist)
 					i++
-					if(zlevel == imp_in.z)
+					if(zlevel == T.z)
 						if(on && pointofreturn)
 							retrieve_exile()
 						else
 							break //we're on a blacklisted z but not on (e.g. station prior to being exiled) so stop
 					else
 						if(!on && i >= blacklist.len)  //we've just arrived on a non-blacklisted z, start blocking
 							on = TRUE
-							pointofreturn = imp_in.loc //we'll teleport back here if we go out of bounds
+							pointofreturn = T //we'll teleport back here if we go out of bounds
 
 			if(whitelist.len && usewhitelist)
 				for(var/zlevel in whitelist)
-					if(zlevel == imp_in.z)
+					if(zlevel == T.z)
 						if(!on)
 							on = TRUE //we're on a whitelisted z, start blocking
-							pointofreturn = imp_in.loc //we'll teleport back here if we go out of bounds
+							pointofreturn = T //we'll teleport back here if we go out of bounds
 						return // we're allowed here, stop
-
 				if(on && pointofreturn)
 					retrieve_exile()
 
 /obj/item/implant/teleporter/proc/retrieve_exile()
-	if(!is_centcom_level(imp_in.z))
+	var/turf/T = get_turf_global(imp_in)
+	if(!is_centcom_level(T.z))
 		do_teleport(imp_in, pointofreturn, 0, channel = TELEPORT_CHANNEL_WORMHOLE)
 		say(retrievalmessage)
 
@@ -80,14 +81,13 @@
 
 	if(user)
 		log_combat(user, target, "implanted", object="[name]")
-
+	var/turf/T = get_turf_global(imp_in)
 	if(useblacklist && !blacklist.len)
-		blacklist += imp_in.z
+		blacklist += T.z
 
 	if(usewhitelist && !whitelist.len)
-		whitelist += imp_in.z
-		pointofreturn = imp_in.loc
-
+		whitelist += T.z
+		pointofreturn = T
 	return 1
 
 /obj/item/implant/teleporter/removed(mob/living/source, silent = 0, special = 0)