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On modern Macs since some time before 2016 there is a hardwired line from the sensor to the LED that is not vulnerable to a firmware hack[0]. However, if an app just takes still photos the light could be on for a very brief period of time.

[0]https://daringfireball.net/2019/02/on_covering_webcams



Also, the Mic is disconnected in hardware when you close the lid:

https://support.apple.com/guide/security/hardware-microphone...




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