Bone microchip

At birth the government would implant a microchip in every infant's skull, similar to the one you can have put in your cat. It would have your name, DOB, place of birth, nationality/ties and a record of every criminal offence you've commited would be added to your chip upon conviction. If the police were looking for a John Smith with a previous conviction for sexual assault, they would use a search engine that would scan the vicinity within a given area to see if anyone matches the search parameters. It would be implanted somewhere where it could not be dislodged so that if your corpse is decomposing in a field, the police can still scan for you and find your skeleton. Other potential info that could be stored would be names of next-of-kin, credit history, telephone number, e-mail address.