45 CFR 3.22: Request for identification.

Upon request by a police officer, a person involved in any of the following situations must provide identification, for example, by exhibiting satisfactory credentials (such as an employment identification card or driver's license):

(a) A traffic accident within the enclave;

(b) The police officer reasonably believes that the individual is engaged in, or has engaged in, criminal conduct or a violation of the regulations of this part; or

(c) The enclave or a portion of the enclave is not open to the public (see § 3.41).

A driver of a motor vehicle involved in an accident within the enclave shall also exhibit, upon the request of a police officer, the owner's registration card or other satisfactory proof of ownership.