1. A method of regulating continued access to a restricted environment, comprising: storing a facial representation of an individual authorized to have access to the restricted environment; periodically acquiring a facial representation of an individual desiring continued access to the restricted environment; determining repeatedly whether the individual seeking continued access is the authorized individual by comparing the most recently acquired representation to the stored representation to determine the degree to which the most recently acquired representation corresponds to the stored representation; storing additional identifying features representative of an authorized individual; acquiring additional identifying features of the individual desiring continued access to the restricted environment; comparing the acquired additional features and the stored additional features when the degree of similarity between the most recently acquired facial representation and the stored facial representation does not confirm the identity of the individual seeking continued access; revoking access to the restricted environment if the step of determining and the step of comparing indicate that the individual seeking continued access is not the authorized individual.