A 34-year-old man was arrested after a car crash at Springfield Road in west Belfast, on Friday.
He is being questioned on suspicion of drugs offences after a suspected cutting agent was found.
Police later found what they believe to be cocaine with an estimated value of £60,000 in a follow-up search in Edenderry.
A 27-year-old woman was also arrested.
Both suspects remain in custody at Musgrave PSNI station.