As with any crime and trial, the prosecution would have to prove that the violation occurred beyond a reasonable doubt. An alleged violation would have to be reported and there must be evidence to back up the accusation. This means that there would either be witnesses who could speak on the violation or some kind of visual proof of it (video recording, photos). If the violation in question is not related to employee conduct and has more to do with alcohol code violations or similar code issues, there would need to be proof of the code violation. This would usually involve an inspection by a government agent which would be sufficient proof, unless properly challenged.