Yes. The defenses available to you will depend on the facts of your case. It may be possible to challenge the basis of your stop by police -- police must have reasonable suspicion or probable cause that some violation of law has occurred or is occurring to stop you. If drugs were found in a warrantless search, it may be possible to argue that police did not have a basis to rely on any of the legal exceptions that authorize a warrantless search. Or if the police had a search warrant, it might be possible to challenge the validity of that warrant. Finally, it may be possible to challenge whether you had possession of the drugs recovered by police.