It is a United States Act of Congress, and part of the United States Code, which places stringent record-keeping requirements on the producers of actual, sexually explicit materials. The guidelines for enforcing these laws (colloquially known as 2257 Regulations (C.F.R. Part 75), part of the United States Code of Federal Regulations, require producers of sexually explicit material to obtain proof of age for every model they shoot, and retain those records. Federal inspectors may at any time launch inspections of these records and prosecute any infraction.