I read similar information earlier. However, at that time, it was reported in Mumbai airport.
Just for every one's information, one of my co-passengers (he is an old man and travelling on green card) was asked to disembark from Mumbai-JFK bound AI flight when I first travelled to US. Specifically, it was happened on February 12/13 2000. Please note that this is not hoax. If any one have any doubts, they can verify this information. The reason for asking to disembark was at Mumbai airport, some how his passport was missing. On that day, the flight was delayed by more than 9 hours and the passenger was having boarding pass and we already made on trip from Mumbai to New Delhi and back to Mumbai due to some technical problem at New Delhi airport. That means, he was verified at Mumbai airport. Not sure what happened subsequently.
Therefore there is nothing wrong in watching what is happening around us at emmigration/immigration points.
Thanks
SRK