If he presented it as a bomb or used it to scare anyone, then yes he broke the law. Otherwise you'll have to prove intent.
And if he was arrested, he has a right to a lawyer when he asks for one. he requested a lawyer and they continued to question him without providing a lawyer. That is a violation of his constitutional rights.
He was told to put the "clock" away. Did he? He continued to show his "invention" and played on teachers paranoia and stirs up all this controversy. One of teachers got scared, that's enough to claim hoax bomb even if isn't one.
Gets charged with a bomb hoax, placed in cuffs and taken to the police station. Was he cooperating and answering questions? He requested a lawyer. Did he?
What constitutional rights were violated? Where that came from? That desperate for an excuse?
Nothing he said is consistent. He claimed "he build it from scratch", it's his "invention". That's enough for shitlibs to accept him as next prodigy and encouraged by given attention he continued with his claims...
Claims he built the clock from scratch in 20 minutes. Claims that he's going to an invent a hover-board that moves sideways (good luck with that, might need some plutonium for the real deal), claims he builds CPU. Libtards still eat it all up, and people are still defending him for being traumatized and why he can't speak well, while sister admits to an MSNBC executive of how she was suspended for a threat she made prior.