In the US, Border Patrol only have the authority to do these things if you are attempting to enter the US. Apparently, that hasn't stopped them from asking poli

In the US, Border Patrol only have the authority to do these things if you are attempting to enter the US. Apparently, that hasn't stopped them from asking politely on domestic flights: https://www.theatlantic.com/politics/archive/2017/02/papers-please/517887/ https://www.theatlantic.com/politics/archive/2017/02/papers-...