A better feature would be a 2nd PIN that unlocks the phone to a secondary profile, which you would leave pretty bare for situations like these.

With some embarrassing porn; something that would make it feel legit and cause a distraction.

A few hundred personal dick pics and they'll be handing it back quickly.

Or smarter yet, not bare. Looks like a normal phone - innocent-looking vacation photos, innocent-looking social media accounts, innocent-looking email....