preventing installation of robotic brain in organic chest

code/modules/surgery/organs/organ.dm

@@ -30,6 +30,7 @@
 	var/tough = FALSE //can organ be easily damaged?
 	var/emp_proof = FALSE //is the organ immune to EMPs?
 	var/hidden_pain = FALSE //will it skip pain messages?
+	var/requires_robotic_bodypart = FALSE
 
 
 /obj/item/organ/Destroy()

code/modules/surgery/organs/subtypes/machine.dm

@@ -144,4 +144,5 @@
 	dead_icon = "posibrain"
 	parent_organ = "chest"
 	status = ORGAN_ROBOT
-	species = "Machine"
+	species = "Machine"
+	requires_robotic_bodypart = TRUE // Can't stick this in someone's chest, unless their chest is robotic

code/modules/surgery/organs_internal.dm

@@ -101,6 +101,9 @@
 	if(is_int_organ(tool))
 		current_type = "insert"
 		I = tool
+		if(I.requires_robotic_bodypart)
+			to_chat(user, "<span class='warning'>[I] is an organ that requires a robotic interface[target].</span>")
+			return -1
 		if(target_zone != I.parent_organ || target.get_organ_slot(I.slot))
 			to_chat(user, "<span class='notice'>There is no room for [I] in [target]'s [parse_zone(target_zone)]!</span>")
 			return -1
@@ -257,12 +260,14 @@
 
 	else if(current_type == "insert")
 		I = tool
-		user.drop_item()
-		I.insert(target)
-		spread_germs_to_organ(I, user, tool)
-		if(!user.canUnEquip(I, 0))
+		if(I.requires_robotic_bodypart)
+			to_chat(user, "<span class='warning'>[I] is an organ that requires a robotic interface[target].</span>")
+			return FALSE
+		if(!user.drop_item())
 			to_chat(user, "<span class='warning'>[I] is stuck to your hand, you can't put it in [target]!</span>")
 			return 0
+		I.insert(target)
+		spread_germs_to_organ(I, user, tool)
 
 		if(affected)
 			user.visible_message("<span class='notice'> [user] has transplanted [tool] into [target]'s [affected.name].</span>",