I find it believable because:

1. Other journalists have already been arrested for their views on Palestine like Richard Medhurst and Ali Abunimah. Abunimah got pretty close to being disappeared into a black site in Switzerland.

2. Some Muslim dude named Hasan being "randomly" selected for further inspection by TSA is a sadly mundane event that isn't even news.

3. Hasan has appeared in various mainstream Zionist publications like Haaretz in a very "will no one rid me of this turbulent priest" way. I personally think Hasan needs to worry about security and have an escape plan to leave the US.