Not good enough!
Through the intercom, you order them (in your best barking "telescreen voice") to look directly into your camera, then in profile (left and right), then to visibly and audibly pat themselves down. They must then hold their I.D. up close to the camera (after you thus learn their names, you henceforth address them only as "6079 Smith!" etc.), then also open any valise they may be carrying with them, and show the contents.
And after all that, you tell them to go take a hike!
Regards,