Suit sensors with locked sensors cannot be removed from clothing.

code/datums/extensions/multitool/items/clothing.dm

@@ -14,5 +14,5 @@
 	if(!sensor)
 		to_chat(user, SPAN_WARNING("\The [uniform] doesn't have a vitals sensors attached."))
 		return
-	sensor.sensors_locked = !sensor.sensors_locked
-	user.visible_message(SPAN_NOTICE("\The [user] [sensor.sensors_locked ? "" : "un"]locks \the [user]'s suit sensor controls."), range = 2)
+	sensor.toggle_sensors_locked()
+	user.visible_message(SPAN_NOTICE("\The [user] [sensor.get_sensors_locked() ? "" : "un"]locks \the [user]'s suit sensor controls."), range = 2)

code/datums/outfits/outfit.dm

@@ -76,7 +76,7 @@ var/global/list/outfits_decls_by_type_
 				succeeded = TRUE
 			qdel(wear_uniform)
 		if(!succeeded)
-			. += "outfit is flagged for sensors, but uniform do not accept sensors"
+			. += "outfit is flagged for sensors, but uniform does not accept sensors"
 		qdel(sensor)
 
 /decl/hierarchy/outfit/proc/pre_equip(mob/living/carbon/human/H)

code/modules/clothing/_clothing.dm

@@ -267,10 +267,10 @@
 	var/obj/item/clothing/accessory/vitals_sensor/sensor = locate() in old_clothes.accessories
 	if(!sensor)
 		return
+	sensor.removable = TRUE // This will be refreshed by remove_accessory/attach_accessory
 	old_clothes.remove_accessory(null, sensor)
 	attach_accessory(null, sensor)
-	if(!(sensor in accessories))
-		qdel(sensor)
+
 
 /decl/interaction_handler/clothing_set_sensors
 	name = "Set Sensors Level"

code/modules/clothing/clothing_accessories.dm

@@ -69,7 +69,7 @@
 	update_clothing_icon()
 
 /obj/item/clothing/proc/remove_accessory(mob/user, obj/item/clothing/accessory/A)
-	if(!A || !(A in accessories))
+	if(!A || !(A in accessories) || !A.removable || !A.canremove)
 		return
 
 	A.on_removed(user)
@@ -94,11 +94,21 @@
 	if(!LAZYLEN(accessories))
 		return
 
+	var/list/removable_accessories = list()
+	for(var/obj/item/clothing/accessory/accessory in accessories)
+		if(accessory.canremove && accessory.removable)
+			removable_accessories += accessory
+
+	if(!length(removable_accessories))
+		to_chat(usr, SPAN_WARNING("You have no removable accessories."))
+		verbs -= /obj/item/clothing/proc/removetie_verb
+		return
+
 	var/obj/item/clothing/accessory/A
-	if(LAZYLEN(accessories) > 1)
-		A = show_radial_menu(M, M, make_item_radial_menu_choices(accessories), radius = 42, tooltips = TRUE)
+	if(LAZYLEN(removable_accessories) > 1)
+		A = show_radial_menu(M, M, make_item_radial_menu_choices(removable_accessories), radius = 42, tooltips = TRUE)
 	else
-		A = accessories[1]
+		A = removable_accessories[1]
 
 	remove_accessory(usr, A)
 

code/modules/clothing/under/accessories/vitals_sensor.dm

@@ -14,6 +14,23 @@
 		"Tracking beacon"
 	)
 
+/obj/item/clothing/accessory/vitals_sensor/Initialize()
+	. = ..()
+	if(isnull(sensor_mode) || sensor_mode < VITALS_SENSOR_OFF || sensor_mode > VITALS_SENSOR_TRACKING)
+		set_sensor_mode(rand(VITALS_SENSOR_OFF, VITALS_SENSOR_TRACKING))
+	update_removable()
+
+/obj/item/clothing/accessory/vitals_sensor/proc/toggle_sensors_locked()
+	set_sensors_locked(!get_sensors_locked())
+
+/obj/item/clothing/accessory/vitals_sensor/proc/get_sensors_locked()
+	return sensors_locked
+
+/obj/item/clothing/accessory/vitals_sensor/proc/set_sensors_locked(new_state)
+	if(get_sensors_locked() != new_state)
+		sensors_locked = new_state
+		update_removable()
+
 /obj/item/clothing/accessory/vitals_sensor/examine(mob/user)
 	. = ..()
 	switch(sensor_mode)
@@ -26,10 +43,20 @@
 		if(VITALS_SENSOR_TRACKING)
 			to_chat(user, "Its vital tracker and tracking beacon appear to be enabled.")
 
-/obj/item/clothing/accessory/vitals_sensor/Initialize()
+/obj/item/clothing/accessory/vitals_sensor/on_attached(obj/item/clothing/S, mob/user)
 	. = ..()
-	if(isnull(sensor_mode) || sensor_mode < VITALS_SENSOR_OFF || sensor_mode > VITALS_SENSOR_TRACKING)
-		set_sensor_mode(rand(VITALS_SENSOR_OFF, VITALS_SENSOR_TRACKING))
+	update_removable()
+
+/obj/item/clothing/accessory/vitals_sensor/on_removed(mob/user)
+	. = ..()
+	update_removable()
+
+/obj/item/clothing/accessory/vitals_sensor/proc/update_removable()
+	var/obj/item/clothing/clothes = loc
+	if(istype(clothes) && (src in clothes.accessories))
+		removable = !sensors_locked
+	else
+		removable = TRUE
 
 /obj/item/clothing/accessory/vitals_sensor/proc/set_sensor_mode(var/new_sensor_mode)
 	if(sensor_mode != new_sensor_mode)

code/modules/clothing/under/color.dm

@@ -13,7 +13,7 @@
 /obj/item/clothing/under/color/orange/Initialize()
 	. = ..()
 	var/obj/item/clothing/accessory/vitals_sensor/sensor = new(src)
-	sensor.sensors_locked = TRUE
+	sensor.set_sensors_locked(TRUE)
 	sensor.set_sensor_mode(VITALS_SENSOR_TRACKING)
 	attach_accessory(null, sensor)
 

code/modules/mob/living/carbon/human/npcs.dm

@@ -27,7 +27,7 @@
 /obj/item/clothing/under/color/white/blank/Initialize()
 	. = ..()
 	var/obj/item/clothing/accessory/vitals_sensor/sensor = new(src)
-	sensor.sensors_locked = TRUE
+	sensor.set_sensors_locked(TRUE)
 	sensor.set_sensor_mode(VITALS_SENSOR_OFF)
 	attach_accessory(null, sensor)
 

code/modules/mob/mob.dm

@@ -367,7 +367,7 @@
 		dat += "<BR><b>Pockets:</b> <A href='?src=\ref[src];item=pockets'>Empty or Place Item</A>"
 	var/obj/item/clothing/accessory/vitals_sensor/sensor = get_vitals_sensor()
 	if(sensor)
-		if(sensor.sensors_locked)
+		if(sensor.get_sensors_locked())
 			dat += "<BR><A href='?src=\ref[src];item=lock_sensors'>Unlock vitals sensors</A>"
 		else if(user.get_multitool())
 			dat += "<BR><A href='?src=\ref[src];item=lock_sensors'>Lock vitals sensors</A>"

code/modules/mob/stripping.dm

@@ -34,7 +34,7 @@
 			var/obj/item/clothing/accessory/vitals_sensor/sensor = get_vitals_sensor()
 			if (!istype(sensor))
 				return
-			visible_message(SPAN_DANGER("\The [user] is trying to [sensor.sensors_locked ? "un" : ""]lock \the [src]'s sensors!"))
+			visible_message(SPAN_DANGER("\The [user] is trying to [sensor.get_sensors_locked() ? "un" : ""]lock \the [src]'s sensors!"))
 			if (do_after(user, HUMAN_STRIP_DELAY, src, progress = 0))
 				if(QDELETED(sensor) || sensor != get_vitals_sensor())
 					to_chat(user, SPAN_WARNING("\The [src] is not wearing \the [sensor] anymore."))
@@ -43,8 +43,8 @@
 				if (!istype(user_multitool))
 					to_chat(user, SPAN_WARNING("You need a multitool to lock \the [src]'s sensors."))
 					return
-				sensor.sensors_locked = !sensor.sensors_locked
-				visible_message(SPAN_NOTICE("\The [user] [sensor.sensors_locked ? "" : "un"]locks \the [src]'s vitals sensor controls."), range = 2)
+				sensor.toggle_sensors_locked()
+				visible_message(SPAN_NOTICE("\The [user] [sensor.get_sensors_locked() ? "" : "un"]locks \the [src]'s vitals sensor controls."), range = 2)
 			return
 		if("internals")
 			visible_message("<span class='danger'>\The [usr] is trying to set \the [src]'s internals!</span>")
@@ -137,7 +137,7 @@
 	var/obj/item/clothing/accessory/vitals_sensor/sensor = get_vitals_sensor()
 	if(!istype(sensor))
 		to_chat(user, SPAN_WARNING("\The [src] is not wearing a vitals sensor."))
-	if (sensor.sensors_locked)
+	if (sensor.get_sensors_locked())
 		to_chat(user, SPAN_WARNING("\The [src]'s suit sensor controls are locked."))
 		return
 	admin_attack_log(user, src, "Toggled their suit sensors.", "Toggled their suit sensors.", "toggled the suit sensors of")
@@ -147,6 +147,4 @@
 	for(var/check_slot in global.vitals_sensor_equip_slots)
 		var/obj/item/clothing/equipped = get_equipped_item(check_slot)
 		if(istype(equipped))
-			var/sensor = locate(/obj/item/clothing/accessory/vitals_sensor) in equipped.accessories
-			if(sensor)
-				return sensor
+			return (locate(/obj/item/clothing/accessory/vitals_sensor) in equipped.accessories)