alt Hacker NewsOne of the GrapheneOS people (I think) suggested keeping a bit of paper in your wallet with the duress pin, perhaps thinly disguised. Then the cops could try it on their own initiative. I suppose they'd become aware of that trick eventually, but then they wouldn't be able to use all those other genuine pins they find.
Replies
A far better approach is for the US citizen to simply say "I chose not to provide my PIN".
The officer will say something like "That's your choice, but I will need to seize the device to conduct an analysis. It will be returned once the analysis is complete".
Then you shrug, and they will let you enter the US. The cops will try to get into the phone, fail, and return it to you.
Just bring a phone you don't mind losing for a few months.
This is an interesting idea, but was that GrapheneOS person a lawyer giving legal advice?