Around 200 suspected cannabis plants have been found by police at a house in Buxton.
Officers stopped and searched two men and one woman on Spring Gardens on Thursday, July 28.
One of the men, a 41-year-old from Buxton, was arrested and subsequently charged with possessing cannabis, and a 34-year-old woman from Stockport was arrested on suspicion of possessing a Class A drug.
She has been bailed pending further enquiries.
As part of the investigation, officers searched a house on West Road later that day and found the plants.
A 42-year-old man from Buxton was arrested on suspicion of cultivation of cannabis and later bailed pending further enquiries.
l Anyone with information about drugs should contact Derbyshire police on 0345 123 33 33 or call Crimestoppers anonymously on 0800 555 111.