Signal lights can be disabled!
Checkoway has created a software to prove that its discovery is correct, and it applies to MacBooks released from 2008 and earlier. It is also possible that newer Macs may also be hacked in this way, but no one has yet made a specific implementation. Of course, such unauthorized webcam activation is in violation of user privacy laws.
Marcus Thomas , a former FBI technology executive, also revealed that the security agency found a way to activate the webcam on the computer without signaling. That method has been used by the FBI for many years to track suspects.