Rams cornerback Trumaine Johnson, a third-round draft pick by the Rams in 2012 out of the University of Montana, was arrested Friday for driving under the influence in Missoula, Mont.

Johnson was booked at 3:05 a.m. according to Missoula County Jail records and released at 4:13 a.m. after posting a $700 bond. It's a misdemeanor charge.

According to KPAX.com, Johnson was pulled over at 2 a.m. by a Missoula Police Department officer because his headlights weren't on. Johnson subsequently refused to take a breath test.

Johnson, 23, appeared in 16 games with three starts last season as a Rams rookie. He took over as the team's third corner midway through the season, moving ahead of Bradley Fletcher on the depth chart.

He finished with 35 tackles, eight pass breakups, and two interceptions, and figures to be among the Rams' top three corners entering the 2013 season behind starters Cortland Finnegan and Janoris Jenkins.

Friday's incident along with Jenkins' suspension for a game last season after partying with two teammates before the Rams Nov. 11 contest at San Francisco could increase the need for the team to add another cornerback, either in the draft or what remains in free agency.