Here is an experiment we should all do at home.

Those of you who do it, please report your results.

You can buy dummies that plug into the Mic jack and short, so that no mic is active when its in. I bought a decent mic for doing interviews and it has a mute switch and for sure the built in mic does not work when I have that on.

But there has to be a better way. Software maybe that turns off your mic?