NPR reports that the head of the FBI doesn’t trust his computer’s (Mac or Windows, we’re not told) security enough to expose the webcam.  That in itself is pretty interesting but the article goes on (my emphasis):

But as the San Bernardino iPhone fight made clear, the privacy debate in the U.S. is no longer just about legal processes and judicial oversight. It’s about whether unhackable devices should be allowed to exist, warrant or no warrant. And a taped-over webcam is about as unhackable as a device can get.