Peeping Tom laws—also known as voyeurism laws or invasion of privacy laws—generally make it illegal and a criminal offense to peek into windows or doors on private property to view a person who is fully or partially naked for the purpose of sexual desire or gratification.

Peeping Tom laws vary from state to state and some states require that the victim not realize he or she was being viewed and that the victim had a reasonable expectation of privacy (was in a place where it was reasonable to expect privacy). And some states specifically address the use of unmanned aircraft (drones), cameras, video cameras, and binoculars in connection with such peeping. Some state statutes specifically prohibit peeking into bathrooms, dressing rooms, showers, and baths. And some states characterize this criminal offense as trespassing with the intent to peer or peep.

Peeping Tom laws are located in a state’s statutes—often in the penal or criminal code.

In Maine, Peeping Tom laws are addressed under the state's invasion of privacy statutes. Maine law criminalizes the act of spying on another person without their consent when that person has a reasonable expectation of privacy. This includes observing, photographing, or recording a person who is partially or fully undressed in a place where they would expect privacy, such as in their home, bathroom, or dressing room. The use of devices like cameras and binoculars to commit these acts can lead to more severe charges. Additionally, Maine law considers it a criminal invasion of privacy to install equipment to record or observe someone in a private place without their consent. The state's statutes also cover the use of drones for such activities, which is prohibited when it infringes on someone's reasonable expectation of privacy. Violations of these laws can result in criminal charges ranging from misdemeanors to felonies, depending on the circumstances and the presence of aggravating factors.