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A Maryland man has pleaded guilty to placing hidden cameras in rooms he rented to three people and using them to record the tenants while they were naked or engaged in intimate acts, reports the Post:

[Dennis] Van Dusen was renting out three rooms in his home, a blue-gray house on tree-lined Ridgewood Avenue, about a mile north of the District, according to police reports and court records. Two of the rooms are on an upper level, and the other is in the basement. Everyone shared the house’s common areas, according to police reports.

In October 2012, a tenant in the basement became concerned about the smoke alarm above her bed.

“Whenever the power would go out, all the smoke detectors on her level would beep, but the one above her bed did not,” according to Montgomery police documents.

The tenant said she and her boyfriend then examined the smoke detector and found video-recording equipment and wires leading back into the ceiling. In the early morning of Oct. 13, she called police, and two officers went to her apartment and took photographs of the device, according to police reports.

Van Dusen will be sentenced later this year, and will serve no more than 18 months in prison.