The lawyer for "Teen Mom" star Jenelle Evans tells TMZ ... his client is the victim of a set up, and money is at the bottom of it all.
Dustin Sullivan, Jenelle's lawyer, tells us he has a "serious problem" with the fact that Brittany Maggard -- the woman who pushed Jenelle before the brawl -- and other parties involved were "paid substantially" for pictures and videos related to the incident.
Sullivan says it's suspicious that cameras were present when Jenelle arrived -- indeed, Sullivan says, multiple cameras were present capturing different angles of the impending brawl.
Sullivan is in the process of interviewing witnesses to determine if Britany Truett -- the woman who caught the beatdown -- pre-programmed the melee.
And, Sullivan says, it's "highly suspicious" Britany waited five days before calling the cops.
Sullivan says if there's proof of a set up, he will make that a centerpiece of the case when it goes before a jury.