I once set my phone to recording with the screen locked and left it inside the front pocket of my shirt. Since the amp i visited had the massage table in front of the door, i just simply hang my shirt on the door with the phone's camera facing the table.
With Apple's iCloud, it synced the video to the cloud and even though i deleted the video...several months later i was browsing the cloud and the video was infront of my face..fortunately, i was alone...but what if i wasnt!
Now, the only recording i do is mental! It stays with me until i loose my mind lol