[trhway]

>maybe that means something different in America? It's just an arrest

an arrest record searchable by all the prospective employers (until you spend an effort/money to seal it in jurisdictions where it is possible, and even then you still would have to disclose it any time you deal with federals). Good luck finding a job anywhere where computers are present with an arrest for hacking.

[zaarn]

I don't believe you can get arrest records for a background screening on a employee like that in the UK (or the rest of Europe). You'd need a damn good reason why you want one so thorough and last I checked, in my country that means you're going for teacher, social worker, government office, etc. And even then this wouldn't be reason for denial if the arrest is not related to your job or you can reasonably explain the matter.