OK I have a history with this question and I think I have that answer.
Yes a wireless camera can be used on your robot, provided it does not transmit on the 900 MHz band (many transmit on the 2.4 GHz range), to transmit anywhere
but the player station. As soon as it transmits to the player station it's a sensor and not a decoration thus following the custom circuit rule of not being allowed to transmit to the player station. It's kind of a funny loop of two rules. I plan to use one but I'll be picking up the feed on my PC in the pits for website content. FIRST has been asked about this and their response in previous years has been what I said above, feel free to ask but I don't see any indication from the rules that they have changed their minds. If you still want a camera go to
www.supercircuits.com They are literally the best place on the web, even Discovery channel interviewed them when they wanted info about spy cameras.