Merge pull request #11841 from Crazylemon64/fix_cheaty_ghosts

Fixes an exploit allowing ghosts to teleport their bodies

code/modules/mob/dead/observer/observer.dm

@@ -405,7 +405,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	A.on_close(CALLBACK(src, .proc/teleport))
 
 /mob/dead/observer/proc/teleport(area/thearea)
-	if(!thearea)
+	if(!thearea || !isobserver(usr))
 		return
 
 	var/list/L = list()
@@ -416,7 +416,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		to_chat(usr, "<span class='warning'>No area available.</span>")
 		return
 
-	usr.forceMove(pick(L))
+	forceMove(pick(L))
 	following = null
 
 /mob/dead/observer/verb/follow()
@@ -430,7 +430,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 
 // This is the ghost's follow verb with an argument
 /mob/dead/observer/proc/ManualFollow(var/atom/movable/target)
-	if(!target)
+	if(!target || !isobserver(usr))
 		return
 
 	if(!get_turf(target))
@@ -504,7 +504,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		A.on_close(CALLBACK(src, .proc/jump_to_mob))
 
 /mob/dead/observer/proc/jump_to_mob(mob/M)
-	if(!M)
+	if(!M || !isobserver(usr))
 		return
 	var/mob/A = src			 //Source mob
 	var/turf/T = get_turf(M) //Turf of the destination mob