A friend of mine (US citizen) was recently sidelined into the 'back room' at JFK, made to wait two hours, was then asked a series of simple and asinine questions for 2 minutes and told he could leave as it was a "routine check". They did not check his baggage, nor did they care to when he specifically asked them if they were going to do so.

Written across his landing card in red was "CTR". Anyone know what this means?