Wow what a shame, this was a big mistake.
Check it out:

Zero tolerance strikes again, with a vengeance: A Maryland high school expelled a well-behaved 18-year-old student who accidentally brought a shotgun onto school property because he left it in his car after returning from a hunting trip.

The student, 18-year-old Patrick Bryan Mitchell, was expelled from South River High School. He was also arrested by county police and received a mugshot. He is barred from possessing a gun for a year.

He missed his senior lacrosse season, several weeks of school, and his chances at an athletic scholarship to Pfeiffer College were crushed. He was forced to drop out of two Advanced Placement courses, and has attempted to keep up with his studies by enrolling in online classes.