Is the use of audio surveillance at work a violation of my rights?

The outcome of this question may depend on where the recording took place and whether you had a reasonable expectation of privacy at that place. For example, if you told the dirty jokes in an open, customer-service area, the result might be different from telling them in a locker room or bathroom. It is impossible to provide a categorical answer from the facts presented. As a general matter, employers may terminate employees for any reason or no reason at all.