Kick A Player When Instance Created?

alright so this seems simple enough and i know the name of the script that i am looking for but the issue is the scripts.Parent is set to nil and i have played a game a long time ago that kicked players immediately for injecting the same script and ive never been able to replicate that but now ive gone back and redownloaded it after 2 years and i found out the name of the script but i have no idea how i would detect it if its parent is set to nil