
If this was used intelligently - then I can see the benefit. Unfortunately British cops have had their intelligence sacrificed on the great public alters of Political Correctness, League Tables and Performance Reports.
Before anyone shoots me down (I left my table leg and Oyster card at home) - there used to be a time where your average beat bobby knew exactly who the 8 or 10 little scumbags in his area were, and generally left everyone else alone unless they were doing something stupid. Even if you were caught for a High Crime, such as missing the bin with 1 errant chip, he'd probably just ask you to pick it up. No arrest, no DNA taken, no £100 fine and criminal record for attempting to defend yourself in court (e.g "the street lamp hasn't worked for 2 months - I didn't see I'd missed the bin").
Anyway - I'd be for these scanners if the cops *did* use such a device to take back control of the streets from "untouchable" little scumbags who know fine well it's too much effort for the cops to arrest them, take them down the nick etc to confirm their identity.
Alas - I suspect the "Papers, Citizen" poster has got the right end of the stick.
Which is why I'll say it again - every cop, plastic plod, for-profit "enforcement" muppet should have "always-on" copper-cams when they're on duty. End of every day - the whole lot is downloaded into a big database, and this DB is put under the custody of an independent civil liberties group. Citizen A (actually, it would be Subject A in the UK) complains about rozzer1 being a prick and tazing her for legitimately questioning why she was being detained/forced to give fingerprints unreasonably - then at least the conversations would be recorded, and be made available to SubjectA on a FoI request. Subject A could then sue Rozzer1 for harassment, unlawful detention, assault etc.
Of course, the bad cops out there would squeal like pigs (er...) about their "civil liberties" - but f*ck em. We are all monitored 24/7 now. Emails/Comms, ANPR, Oyster, CCTV,financial transactions blah blah. It's about re-balancing the equation.
I know it will never happen, but it's nice to dream :)
p.s - I'd also want the gits at British airport security on camera as well. Try being a lying obnoxious little Hitler if Customer A could complain and have the interaction reviewed independently when he comes back! Especially the cow who threatened to have me arrested "because she could".
Mine's the one with the serious chip on the shoulder ;)