I am a law school graduate. What I offer is mere information, not to be construed as forming an attorney client relationship.
As to surveilance at work, it is very liberal. Here is the law:
Monitoring employees
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Before you make another telephone call from your job, make sure that nothing you say during the call can be used against you. That means no criticizing the boss, no scheduling job interviews, and no sharing company secrets. Title One of the Electronic Communications Privacy Act grants your employer the right to silently record your telephone conversations. The law also allows your employer to videotape you and your co-workers, as long as cameras aren’t placed where people should have a reasonable expectation of privacy, such as in the restroom or in a private office. Most employers who monitor their employees do so to ensure quality control. There are guidelines that employers must follow, however. First, they must tell employees in advance that they may be subject to monitoring, and give them the opportunity to offer their consent in writing. Second, employers should give feedback to employees on the evidence collected during monitoring. And third, the recording of a telephone conversation should stop once it becomes clear that the conversation is personal. Whether the last step is followed depends on the integrity of the person doing the recording. The information that an employer can gather when monitoring workers may result in simple embarrassment or termination if rules have been broken. To find out more about this issue, consult a labor and employment law professional in your area.