If the camera is not concealed and the recording is not surreptitious, it is legal.
And the employer can terminate any employee for any reason -- or for no reason at all -- at any time, except for a reason based on illegal discrimination such as race, gender, etc.
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Not every state requires having the camera in a conspicuous place. California's law is much different than the rest of the country. Employers can generally record anywhere as long as it is not in a place where people change OR in places where they give people an expectation of privacy (which is rare).
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