Yah. That's the ticket. Drop $150 to take an exam, study up and be ready, and then be denied testing for attempting to bring something "out of the ordinary" into the room. When they say no, explain to the person who doesn't give a rip about what's on the test that some AC says it's okay.
When you finish explaining what an AC is, and show them which one, they'll still say "I don't see this on the list."
All the while, you've not taken the test, but they've sure taken your money.
While you're at it, do a check in on farcebook with the name of the test center. Supposedly they love that.
Good Luck!