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A nice intermediate step is to attach a small light directly to the mic/camera, so that the light is on whenever they are being used.

They already do this for the camera, though I'm not sure if it's hardware or software.

It's firmware, loaded on boot and replaceable by someone with root permissions.

So it's not a trivial thing to bypass, but it's not secure. Use a sticker or post-it note if you're paranoid.

Are you sure? A day or two ago someone on HN said that newer MacBooks had the LED wired in series with the camera's power supply.