Generally speaking, it's legal in the United States to record surveillance video with a hidden camera in your home without the consent of the person you're recording. That's why the use of nanny cams is becoming increasingly common among parents and guardians who work outside their homes during the day. But before you place a hidden camera or nanny cam in your home, it's a good idea to research the laws in your state. For an extra measure of security, you may also want to speak to an attorney about the specific ways you plan to use your camera.

One important distinction to keep in mind is the difference between audio recording and video recording. Across the country, the restrictions regarding audio surveillance are a lot tougher (which we'll discuss further later in this piece). In most states, it's illegal to record hidden camera video in areas where your subjects have a reasonable expectation of privacy. In your home, these areas might include bathrooms and bedrooms (if your subject lives with you--as in the case of a live-in nanny).

Not every state expressly bans the use of hidden cameras in places where a subject might have a reasonable expectation of privacy. But that doesn't mean you should assume it's legal--or morally acceptable--to record a subject without his or her consent in any private area.

Also remember that it's illegal in the United States to record video (or audio) with the express purpose of blackmail or other "malicious intent." Even if you follow all other laws governing covert surveillance in your state, it's important to keep in mind that your rights are waived if you engage in criminal behavior.

I clearly stated that the laws vary by state and, further, that the requirements also vary by agency. Per your request, I will not engage with you further on this matter or attend to any messages from you.