BERKELEY (CBS SF) — A recording device was discovered in a restroom of a University of California at Berkeley dormitory last week, according to police.

The camera was discovered last Friday in a women’s staff restroom on the lower level of the Unit 1 Central Building, UC Berkeley police said.

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It apparently had been there since late April, when a sign was posted on the public restroom of the building directing women to use the staff restroom, according to police.

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The staff restroom was down the hall from the public restroom, near the loading dock, police said.

Police are investigating a person of interest in the case who is no longer associated with UC Berkeley. Staff are checking all residence hall restrooms for other recording devices, police said.

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Anyone who used the dorm’s staff restroom between late April and last Friday has been asked to contact UC Berkeley police Detective Pete Odyniec at (510) 642-1606.