Not quite - the police have to ask a judge for authorisation, but it's not during a trial, so there is no opportunity for anyone to oppose it. It's just that there is a formal record so if the system is abused, there is evidence of the fact, extent and who is responsible.
From a legal constraint point of view yes, but from a physical laws of the universe, a cop can do whatever he pleases in that room, alone, with you, and say anything he likes about what transpired.
Cameras? Malfunctioning, those buggers. Your lawyer? You waived that right, you said you were innocent and didn't need one. Phone? Well the officer explained very nicely the situation and you decided to do your best to help. Not sure why you're alleging misdeed now, when you handed your unlocked phone over without prompting...
