Drugs and a knife were seized by police after they stopped a car in Dorchester.
Officers in Dorchester stopped a vehicle in the Kings Road area on Saturday evening.
The car and the driver were searched and substances believed to be Class B drugs were recovered from the vehicle.
A spokesman for Dorchester Police said: "An 18-year-old local man was detained for a Section 23 Misuse of Drugs Act search.
"He was arrested for possession with intent to supply Class B drugs and possession of a bladed article in a public place.
"The male has since been released under investigation whilst enquiries continue."
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