i've been discussing this with a few friends lately and i can't find much info on the net about the subject, but where is the borderline for when a cop can and can't say you have an illegal modification and can make you pop your hood? i'm curious as to what the "actual" laws are for this.

i'm one of those people that give traffic cops a hard time, and i know a few ways to fuck them over on a traffic stop, but i want to know when you can basically say "no" you don't have probable cause for a modification.