Right or no right, I would rather not make my smartphone the focus of police attention at any stage. I don't know how it is with other OS/phones, but my phone

Right or no right, I would rather not make my smartphone the focus of police attention at any stage. I don't know how it is with other OS/phones, but my phone can take photos/video without unlocking. It's dangerous enough to stick a camera in a cop's face, but if you stick an unlocked phone in their face then I wouldn't really blame them for doing a little "asset forfeiture" on the spot. And then your active, locked or unlocked phone is in the custody of police. If I had advance notice of a police confrontation, I'd be putting my phone in lockdown/shutdown mode. And if I were going to a rally/protest/riot/anything political, I'd be removing my sdcard and probably SIM card too, to leave them at home, and show up with a phone that's as empty as possible. This whole bit about waving QR codes as event tickets or mobile transit passes bugs me. There is now even electronic driver's license and ID cards. Because the more we're accustomed to waving around our unlocked phones in busy, public areas, the more risk we face from cops, criminals, or whoever wants to seize that unlocked phone and do some real damage with open access to our accounts. I'm perfectly OK with handing over a physical driver's license or passport to law enforcement in order to prove my identity. It's a whole other ball of wax to present an unlocked smartphone for that purpose, but that's the way we're heading.