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