Drugs with a street value of around £100,000 have been seized by police.
Officers stopped a car on the M74 near Lockerbie, in Dumfries and Galloway, on Friday evening believing there to be herbal cannabis inside.
A 23-year-old man has been arrested and is being detained in custody in connection with the find.
A report will be submitted to the Procurator Fiscal.
In a separate incident, a 22-year-old man has been arrested and charged after police recovered around £88,000 worth of drugs from an address in the Dedridge area of Livingston, West Lothian, on Saturday.
Officers searched a premises on Herald Rise where they found heroin, cocaine and cannabis.
A report has been submitted to the Procurator Fiscal.
Detective Constable Ally Urquhart, based at Livingston police station, said: "Drugs cause untold damage to families across the country and I am pleased to say that this latest activity has ensured that a considerable amount of dangerous substances are now off our streets.
"Police Scotland is committed to reducing the threat, risk and harm which the supply of drugs has on communities and we will continue to take every opportunity possible to disrupt and detect this illegal activity."
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