Here's a complete (as complete as one can build) on his legal troubles
http://en.wikipedia.org/wiki/Brandon_Marshall
Each of the [xx] notes is hyperlinked in the original wikipedia page with the source of the article.
Legal trouble
According to Orlando-Orange County public records (case 48-2004-MM-012392-O), on Halloween 2004, while a student at UCF, Marshall was arrested in Orlando on charges of assault on a law enforcement officer, refusal to obey, disorderly conduct and resisting an officer.[27]
On January 1, 2007, Marshall was present at "The Shelter," a downtown Denver nightclub, along with teammates Javon Walker and Darrent Williams. As the players were leaving the club, Williams was fatally shot in the neck by an unknown assailant. Walker has stated in interviews that the shooter was likely a nightclub patron whose motive was retaliation after being involved in an altercation with Marshall's cousin earlier that night.[28]
On March 26, 2007, Marshall was arrested in the Highlands Ranch suburb of Denver on suspicion of domestic violence after his girlfriend reported that following a domestic dispute, Marshall prevented a taxi she was in from leaving his house.[29] Charges from the incident were later dismissed on May 25, 2007, after Marshall completed anger management counseling.[30]
In the early morning of October 22, 2007, Marshall was arrested in the Denver Metro area at the intersection of 14th and Blake St. for driving under the influence of alcohol.[31] A trial was scheduled for September 16, but Marshall instead agreed to a plea bargain four days earlier; he pleaded guilty to a reduced charge of driving while ability impaired.[32] He was sentenced to one-year probation and 24 hours of community service.
On June 12, 2008, Marshall was ticketed for an illegal lane change, then found to be without his license and proof of insurance.[33] The case was eventually dropped as part of a plea bargain for the October 22, 2007 driving incident involving alcohol.[32]
According to an article published in the Rocky Mountain News on July 28, 2008, Douglas County deputies fielded "about 11" calls to Marshall's home since January 2006. The article stated that one one call resulted in Marshall being arrested (the March 26, 2007 domestic dispute), and some did not involve him at all.[34]
A September 17, 2008 article on CompleteColorado.com indicated that the solicitor's office in Fulton County, Georgia filed misdemeanor battery charges on September 10 for an alleged incident on March 4, 2008, in Atlanta, Georgia. The case was assigned to Judge John Mather in Georgia state court. An email from Judge Mather's office to CompleteColorado.com indicated that no court date had been set, but that the date would likely be in November or December.[35]