My guess is that this is probably for some variation of a stripper/party bus: There's a bus, with strippers and booze in the back, where people party at a higher cost than the establishment, with a degree of exclusivity.
You can kick someone out of a club for taking pictures of the strippers. It's not so easy to kick someone off a bus (without stranding them and causing PR issues with them and their group).
The easiest way to do this is with policy: take pictures, and you get banned (for life). Conveniently make it difficult for them to take pictures by giving them an optional 'cell phone deposit' area; however, this makes use of phones impossible.
As for IR emitters... how about a high-intensity IR laser disco ball, of some sort, along with using displaced spectrum for internal cameras? You may be able to do something with black lights or figure out a way to inhibit automatic focusing of the cameras, making the shots more or less pointless.
If the owner is just trying to monetize the "pictures with strippers" market, he's kinda SOL. You might be able to get something workable with IR filters for a high end camera (leaving cell phones to deal wit horrid pictures) but it's unlikely, since cell phone CCDs already filter IR (often at different frequencies than each other, so it can be hit or miss).