And because of that he most likely will have really hard time getting a job after this
Possibly although given the story about it could go the opposite way.
I get the impression that background checks are basically standard practice in America. That's not generally true in Australia, only in certain industries and roles.
Would he though?
This kid (assuming they go to college, etc) could quite possibly get a job in a lab or some other scientific establishment. At a place like that everyone would know about his case AND know how insane it was.