Heather Needs to take the following advice:
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Yes... on the "air," or on her "zip" device in a studio... or wherever.
First cardinal rule when I was doing live television: as long as the mike is on your body, you can be heard at any time whether you think it's on or not. Do NOT mutter when you are off-camera, walking around, or even in the bathroom. Never say a word that you don't want recorded and possibly played to people you don't want to hear it. Ever. Period.
Too many really bad screw-ups have happened because people got sloppy about remembering that when you're in a studio, everything is fair game all the time.
Once again, her amateur level of professionalism (which is pretty amateur at that) is showing.