Living in Rochester, I actually caught this on a local news station and there was a lot more information. The concern (and perhaps the story) isn't so much the searching (as their rational is that those vehicles are often parked at the entrance and exit lanes blah blah blah) but that the searching is being done by the valets instead of TSA or law enforcement. These individuals (at the moment) are not trained and have no oversight. So when the thefts and such start occurring, you have zero recourse and absolutely no hope of resolution. The point being that we have can assume some level of trust with TSA and law enforcement as they have oversight and procedures to reduce these type of theft events but there's nothing in place with this valet program in Rochester atm.
(And please don't flame me about assume a level of trust with the TSA and law enforcement, I'm just trying to provide more information and some context.)