I am never handing my phone to a cop.
replies(3):
They can hold onto it, and never return it. They can deface it. All of that is a possibilty.
You could argue, a sufficiently locked down phone is a better alternative. If they do something, you'll only lose $$
But they can't potentially look at your banking app, read private notes, messages and emails, operate your home automation, look at your calendar, etc. if all they have is a plastic card.