Could my charges be dropped if there was an unlawful search of vehicle?

This past weekend, I was arrested for possession of marijuana under 50 grams and paraphernalia in a parking lot of a concert venue in New Jersey after the police searched my car because someone in my group approached me with a bag of containing marijuana blunts. The officer said they saw the bag come out of my car, which seemed like it did because we were standing beside my car with the driver's side door open. The officer then asked if there is anything else in there that they needed to know about. I was not handcuffed, but I told them I had contraband in the car and after a search and seizure, they cuffed me, read my rights and I was taken to the station to be processed. I would also like to include that after they cuffed my friend, I did close the door to my car and locked it and no contraband was visible.