is employer action is acceptable as long as employees are notified that their actions will be moniterted?

Answer 1

There is no presumption of privacy in the workplace, except in limited areas such as bathrooms and locker rooms. Employees know or should know that the employer can monitor activities in order to meet its responsibility of providing a safe, healthy and efficient workplace.

Responsible employers warn employees at the time of hire that they are being observed. Other employers rely on veteran employees to tell the newbie where the cameras are.