Fort Walton Beach police say he was arrested Thursday night and charged with possession of a concealed firearm. He was released from jail Friday morning.
According to the arrest report, an officer pulled over Coffee's 2008 Cadillac for excessive speed. Coffee reportedly failed to provide registration or proof of insurance and the vehicle was towed. A cocked pistol was found in the center console.
The former Alabama star left the 49ers in August, saying he wanted to focus on ministry. As a rookie last season, Coffee was the team's second-leading rusher with 226 yards.
A message left Friday night at a phone listing for Coffee was not immediately returned.