A 20-year-old man was arrested in Oundle after being found in possession of what is believed to be a Class A drug.
Searches of his car and home address on Friday (August 9) uncovered further quantities of what is also suspected to be a quantity of Class A drugs.
The man, who is from Warmington, has been released on conditional bail pending further inquiries.
Inspector Phil Holton said: “This is the latest in a number of drugs seizures and arrests in East Northamptonshire.
“Any information provided by the public is carefully assessed and, where possible, further action taken.
“We will not tolerate drugs offences within our communities and are cracking down on those that commit them.
“Anyone with information about drugs crime can ring Crimestoppers on 0800 555111 or contact Northamptonshire Police on 101.”