The secret service has an obligation to inspect every threat made against the president. Every single one, regardless of severity or likeliness. So while I think it's asinine that someone had the gall to suggest that this kid would do something violent to the president, but since someone did (Otherwise they would not have become involved), the Secret Service did have to investigate. They found nothing on the child and let him loose. Normal procedure, nothing that violated any constitutional rights... I just think the kid's teacher/principal were morons for blowing this out of proportion...