you can't implant yourself with a motion detector anymore (#3767)

this was covered by a rule clarification for ages but im trying to get
rid of as many stupid niche rule clarifications as possible

:cl:
add: you can no longer implant yourself with a motion detector
/:cl:

code/__DEFINES/traits.dm

@@ -211,6 +211,9 @@
 //ie. naming a regulation tape "example" will become regulation tape (example)
 #define TRAIT_ITEM_RENAME_SPECIAL "t_item_rename_special"
 
+// This item can't be implanted into someone, regardless of the size of the item.
+#define TRAIT_ITEM_NOT_IMPLANTABLE "t_item_not_implantable"
+
 //-- structure traits --
 // TABLE TRAITS
 /// If the table is being flipped, prevent any changes that will mess with adjacency handling

code/game/objects/items/devices/motion_detector.dm

@@ -22,6 +22,7 @@
 	item_state = "motion_detector"
 	flags_atom = FPRINT| CONDUCT
 	flags_equip_slot = SLOT_WAIST
+	inherent_traits = list(TRAIT_ITEM_NOT_IMPLANTABLE)
 	var/list/blip_pool = list()
 	var/detector_range = 14
 	var/detector_mode = MOTION_DETECTOR_LONG
@@ -309,7 +310,7 @@
 	name = "hacked motion detector"
 	desc = "A device that usually picks up non-USCM signals, but this one's been hacked to detect all non-freelancer movement instead. Fight fire with fire!"
 	iff_signal = FACTION_MERCENARY
-	
+
 /obj/item/device/motiondetector/hacked/pmc
 	name = "corporate motion detector"
 	desc = "A device that usually picks up non-USCM signals, but this one's been reprogrammed to detect all non-PMC movement instead. Very corporate."

code/modules/surgery/implant.dm

@@ -106,6 +106,8 @@
 	if(.)
 		if(is_surgery_tool(tool)) //Make sure you still have all your tools after a surgery.
 			return FALSE
+		if(HAS_TRAIT(tool, TRAIT_ITEM_NOT_IMPLANTABLE))
+			return FALSE
 		if(tool.w_class > get_max_wclass(surgery))
 			to_chat(user, SPAN_WARNING("[tool] is too big to implant into [surgery.target]'s [surgery.affected_limb.cavity]!"))
 			return FALSE