You'll almost certainly get charged with "disposing of evidence" or broadly "obstruction" if you give them a duress pin that scrambles your phone. Maybe get smacked around a bit because you injured their authority over you.

This ruling doesn't get into that question. Based on how courts treat refusing to take a breathalyzer, I'm guessing it opens you up to being detained for 24 hours on suspicion of a crime, giving them time to obtain a warrant. A different write-up says that if you do not give a password, they can detain your device and make you wait; but you are not required to give up the password. No other write-ups I can find mention the password issue.

I know previous rulings have said that Face Unlock does NOT count as forcing your password and is allowed by police in searches. When I go on international trips, I disable Face Unlock on my work phone before going to the airports to block that pathway since my phone contains company proprietary information and Controlled Unclassified Information (CUI). I have nothing embarrassing or illegal or incriminating on my personal phone, so I usually don't bother.

I believe a duress PIN is still a PIN, if they don't specify which they want, and then they enter it, they'd be hard pressed to actually charge you with obstruction.

I'm not a lawyer but I've been told never to give my PIN out.

There's an ongoing case about duress pin use

https://www.theguardian.com/us-news/2026/jul/23/cop-city-protester-phone

The one time cops tried to search my phone (local police not border patrol) I wouldn't give my pin. They eventually gave it back but they wiped my phone.