It was the hotel's CCTV system that caught the suspect as he was leaving, using his cell phone in fact which correlated to the time stamp on the video. This was a key piece of evidence that led to his arrest.
I agree that the suit is without merit. Any effective system of preventing people from hooking up for sexual dates would be so restrictive as to be a major affont to the public.
How would one "prove" to the hotel that your purpose in entering the hotel is not to engage in sex for pay, or other illegal activity?