I personally know of businesses that refuse to allow anyone, including HR managers and in-house investigators to look closely at personnel files for fraudulent ID. By simply checking copies of drivers licenses, green cards and SS cards in employee personnel files, many will be found to be bogus. These checks can be done inexpensively and quickly. Many employers that hire these people do so knowingly. Most of these fraudulent IDs are easy to spot if you look closely and compare them with a legitimate ID.