It wasn't part of the plan, but two British street dealers are now making a fortune posting batches of heroin from Pakistan back home to the UK. They aren't the only ones.
The line has been parroted by politicians and law enforcement officials, but it is wrong for so many reasons.
The proportion of 16 to 24-year-olds using Class A drugs is now the highest it's been for 12 years.
We took a trip to the Essex borough of Thurrock to see how the housing crisis and the "going country" phenomenon is affecting Britain's towns and villages.
And more findings from a university drug study.
The "going country" phenomenon isn't as new as many like to make out. Here is the inside story of the first "county lines" gangs, nearly 20 years ago.
The drug isn't just an integral part of the new Geordie nightclub, but increasingly a the city's legitimate economy.
As well as allowing dealers to inflict violence and prove they're "not to be messed with", they now serve another important purpose.