Re: Am I missing something?
Automatic cross referencing the fingerprints of anyone questioned by the police against a national scale database of every criminal , illegal immigrant and unsolved crime, on the spot, with no suspicion of the person being questioned of being involved in a particular crime.
What could go wrong?
Lets see, your fingerprint is a false positive match for 40 unsolved burglaries two counties over.
The police arrest you on suspicion of being "light fingered Bob" (police nickname for uncaught criminal).
You can prove where you are for some of the burglaries and have an alibi , but some of them you were alone at home watching telly.
Police report just the ones where you don't have an alibi to the CPS, who are down on their quota for cases this month.
Trial eventually collapses (if you are lucky) without additional evidence being provided.
You get pulled over again later - this time you are light fingered Bob with previous arrest and trial against your record.
repeat ad nauseum.