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UPPER MARLBORO, Md. (WUSA9) -- Former Prince George's County police officer, Juan Carter, was sentenced to 20 years in jail with all but 7 years suspended on Thursday.

He was convicted of three counts of misconduct in office andfour counts of theft over $500 for selling seized weapons on the street, according to the Prince George's County State's Attorney Office.

Carter was a member of the firearms interdiction team and responsible for logging in all guns seized from people who were not authorized to have them.

According to authorities, from August 5, 2008 through October 3, 2009, a total of 29 seized guns were not logged into police property.Twelve of those guns were later recovered.

Police are still searching for 17 more guns and said two of the guns were used in crimes.

One gun was used during an attempted carjacking of an off-duty county police officer, who had his left middle finger shot off, while another gun was used during a domestic dispute in Baltimore, according to the state's attorney office.