I got back to Al Ain last night after five weeks in the US. Had a really strange experience returning home last night. At the Dubai airport, I was allowed to completely bypass the customs/security (i.e. my bags were not x-rayed, I still had to get my passport stamped), which had never happened before. But then on the taxi ride to Al Ain, the police had a road block set up just across the Abu Dhabi border. All of the passenger cars were allowed to pass without stopping, but my taxi had to wait for about 5 minutes, then the police wanted to see my passport (the didn't ask the driver for anything). I've never seen or heard of them questioning a passenger like that.