Don’t ever hand your phone to the cops
Even if you’ve got nothing to hide.
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Or learn about app pinning (android) and guided access (iOS)
App pinning has an explicit warning that "personal data may be accessible" and "pinned apps may open other apps". I mean, it's better than nothing, but I'd prefer not to rely on it anyways.
It's a dull knife. The only thing more dangerous than a sharp knife, is a dull one.
It’s a cop, not a child. All it takes is for them to connect your phone to an external device.
... and bypass such sandboxing?