A former Brewster cop faces possible jail time after authorities said he exposed himself to and urinated on a 17-year-old girl and a 21-year-old guy from Connecticut during a Metallica concert at the TD Banknorth Garden.

They say he had been drinking.

Joseph Houston, 29, faces two counts of assault and battery and a count of open and gross lewdness after the Jan. 18 incidnet.

According to the Suffolk County District Attorney’s office, Houston was arrested by MBTA Transit Police at North Station, adjacent to the Garden after Houston was ejected from the concert and refused to leave. During the incident, Houston allegedly flashed his police department badge and referred to one of the security guards trying to escort him out of the concert as “Obama.”

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