No implants, no papers, no cards. Technology is increasing very, very fast, and pretty soon, quick, on the spot, highly thorough and accurate DNA tests should be available. Especially if we make it a priority. That way we can know who we're dealing with. If a job applicant shows up for a nursing home job, gives some other person's name and employment history (so reference checks will come back fine), and fake photo IDs to match, you'll be able to quickly determine of the person is who s/he says he is, or if s/he's really the convicted mugger or rapist who's wanted on a parole violation, and is eager to beat or rape some helpless patients (and BTW, our nation's nursing homes are full of low level staffers who fit this exact description).
Still kind of rubs me the wrong way. If I'm not committing a crime, I shouldn't have to go around proving I'm one of the "good guys" all the time. I should be able to be left alone to go about my business.