Was your vehicle on school property?

If not, you shouldn't have handed over your keys so easily. The laws may not be the same in Texas, but in Virginia, they can't search a parked car without a warrant, or give your consent in writing.

Next time you have shit in your car, park away from school so they can't fuck you over. You gotta be more careful, school are becoming real nazi these days. Was it really necessary to carry a hooka on you, even tho you didn't smoke weed out of it? Most police officers are dumber than hollow wood, they just enforce the law and could give a fuck less about compassion or the truth.

Now if what you say is true, get a lawyer. The evidence has to be processed, part of it is using a lab to determine if it's infact weed residue. This is your ticket out. Fuck pleading guilty.