Depends what you mean by "illegal", there are over two dozen main kinds of illegal. As a massive simplification anything not found in the "criminal law" or "emp

Depends what you mean by "illegal", there are over two dozen main kinds of illegal. As a massive simplification anything not found in the "criminal law" or "employment law" books your employer covers while you're working (and in some states while you're doing things you're only doing because you work, e.g. drive to work). So, very generally speaking, anything you can't get arrested for is covered by your employer.