US authorities often don't have enough evidence to prosecute for the underlying crime, or it may have low penalties, but they often have the evidence to prosecu

US authorities often don't have enough evidence to prosecute for the underlying crime, or it may have low penalties, but they often have the evidence to prosecute for mail fraud or wire fraud(basically any means of electronic communication). Mail/wire fraud are federal offences, so this also involves federal prosecutors and agencies with more resources, surveillance abilities, and higher penalties.