GrapheneOS duress PIN could land a man in prison

Write the duress PIN on a piece of paper in your wallet. Someone searching your phone is probably also searching your wallet and may try the PIN.

Genius. Flips the script. In the process of conducting an illegal search, you deleted my phone causing considerable financial and emotional damage. Lawsuit time.

It probably won’t work, at least (US)domestically. The requirement for obtaining a warrant before searching a phone is part of training because there is a clear Supreme Court ruling to that effect.

That being said, what the law says and what some random asshole does during a stop are not always the same thing.