Jadakiss, born Jason Phillips, and three others were charged with third-degree criminal possession of a weapon in October 2006, when police stopped a 2006 Toyota Camry and were greeted with the smell of marijuana.
According to the Journal News, the car belonged to the driver of the Camry's girlfriend.
When police conducted DNA tests on sweat found on the weapon, the results concluded that three unknown individuals had handled the weapon.
Still, prosecutors will try the rapper on the gun charges.
"He had no knowledge of the gun in the car," Phillips' lawyer, Clement Patti, said. "They're saying that there's a presumption (of possession) … but with no fingerprints, (others') DNA, in the interest of justice they should dismiss the charges."
The driver of the Camry, Darnell Frazier, 25, faces weapons charges in addition to driving while ability impaired by marijuana. Frazier served three years in prison for stabbing a man to death who insulted his rapping.
One of the four occupants testified in front of a grand jury and does not have to stand trial.
Jadakiss is due in court in August.