Here we're going to focus on destructive duress passcodes and PINs for smartphones. If you've been looking for the duress passcode feature on your smartphone, I have bad news for you. Duress passcodes can mean troubleProsecutors have charged Tunick under 18 U.S.C. It's not just in the US that using a duress passcode could land you in trouble. There are also apps with built-in duress passcodes.