I find it ridiculous, almost makes me laugh, they run into these places all guns blazing, dolled up in their uniforms shouting, give these people a real grilling and then ends with "Ok Mr. X. Have a really nice day, and don't forget to pop back and see us every week to get the date of your deportation, thank you so much....."
The interesting parts are seeing them grilling people applying for visas or entering the country, there is some good info for people applying and how the process goes.
