Schools do this all the time. My son's principal was almost pathologically interested in what was in my son's car all the time. To be fair, it was my son's "dark" period.
I got to the school one time because the principal was like, gonna open it. I made my child give me the car keys (after finding out what was in the car which yes, include some paraphernalia. He had a card, I was his caregiver, but I needed to know what was IN that car before deciding how to proceed. The kid got hell from me LATER about it.)
In any case, I went out tot he car with the principal and we had a long argument about the car. Opening it. I kept citing it was my private property and he did not have the right to impact my privacy. I even offered to call the police (that could have gone either way, honestly, but I figured he would like, probably back down as I was so "confident" in my vehicle.)
I would up driving it off in the end. And, while I WAS pretty annoyed with the kid I did BELIEVE that (unless there was a dead body there or something) there was a right to privacy for the vehicle. The principal had not SEEN anything (he admitted it) he was jus SUSPICIOUS.
He was a total tool in any case, but people dictate what is done in the car (Texting and I am FOR that one.) MD I hazily remember wanted to put anti smoking ordinances in the car if a kid was in it. IIRC it did not last.
But society is all over cars big time.
Anna