STILLWATER, OK - SEPTEMBER 05: Wide receiver Justin Blackmon #81 of the Oklahoma State Cowboys warms up before the college football game against the Georgia Bulldogs at Boone Pickens Stadium on September 5, 2009 in Stillwater, Oklahoma. The Cowboys defeated the Bulldogs 24-10. (Photo by Christian Petersen/Getty Images)

STILLWATER, Okla. (June 4, 2012) -- Jacksonville Jaguars first-round draft pick Justin Blackmon has appeared in an Oklahoma courtroom for the first time since his weekend arrest for suspicion of drunken driving.

The former Oklahoma State star wide receiver's attorney entered a not guilty plea for him Monday to a misdemeanor count of driving under the influence. Blackmon was allowed to remain free on $1,000 bond.

Police arrested Blackmon during a traffic stop in Stillwater early Sunday after a breath test allegedly showed his blood alcohol content to be three times the legal limit.

Blackmon left the courtroom surrounded by friends. His attorney, Cheryl Ramsey, declined to comment.

The Jaguars selected Blackmon fifth overall in April's draft. A team spokesman said Sunday the Jaguars are trying to learn more about the arrest and had no comment.