Do you need an ID to watch a rated R movie at Plaza Bonita?

The MPAA R rating clearly states that "Under 17 requires accompanying parent or adult guardian." In simple terms, their website says that Children under 17 are not allowed to attend R-rated motion pictures unaccompanied by a parent or adult guardian. So yes, I would believe that no matter what theater you attend, you would have to show identification to prove whether or not you are at least 17.