Right to Privacy at Work FAQ
Can my employer install cameras in the workplace?
2. Can my employer install cameras in the workplace?
The answer depends on where the employer wants to put the cameras and why. The employer must have a reasonable, legitimate business reason for monitoring employees in this manner (for example, to discourage theft from a cash register or to enhance the security of customers and employees). And some states have made certain areas of the workplace (for example, the bathroom and changing areas) off-limits to this type of monitoring.
Even with a legitimate reason, your employer must inform you and your coworkers that the cameras are there. Also, some states prohibit the use of certain types of surveillance devices, such as one-way mirrors.
For more information on workplace surveillance, see Nolo's article Cameras and Video Surveillance in the Workplace.