A 27-year-old man from London was arrested on suspicion of possession of class A drugs with intent to supply after his car was stopped in Croft Road, Nuneaton in the early hours of Saturday (21 March) morning.
Officers seized a quantity of what they believe to be class A drugs and cash.
The man has been released under investigation while enquiries continue.
Anyone with information that could help police with their enquiries should call 101 quoting crime reference 23/12933/20. Alternatively, information can be provided anonymously to the independent charity Crimestoppers on 0800 555 111.