From the NFL's Constitution & Bylaws (article 9): "Any use by any club at any time, from the start to the finish of any game in which such club is a participant, of any communications or information-gathering equipment, other than Polaroid-type cameras or field telephones, shall be prohibited, including without limitation videotape machines, telephone tapping, or bugging devices, or any other form of electronic devices that might aid a team during the playing of a game."
thanks for this info. Guess all is fair in love & war but not sport competition!!!