That's despicable and if it happened recently, I would hope your cousin would file a complaint with the DHS IG at:
https://hotline.oig.dhs.gov/hotline/hotline.php
Speaking of which, there was just a post on @
TSA, which has been deleted, about a group of soldiers returning home from overseas that stopped at BWI to drop of several people. While there, all the others were made to get off the plane and now the TSA won't let them reboard because their tickets don't indicate a stop in Baltimore!!!!