<p>I'm not sure about the testing irregularities stuff, but according to my AP French teacher (who goes to NJ every year to train the teachers to grade the cassettes), if something happens to the tape while your recording, i.e. it doesn't work, you have a coughing fit, etc., you're supposed to tell the proctor and you can redo it before leaving the room. Once you've left the room they won't let you redo it since there's a chance you'll look something up or whatever. But she also said that if there's a problem when they listen, the graders often will just project what you would have gotten based on your other responses.</p>
<p>Hope this helped!</p>