In the United Kingdom, the county lines drug supply model is the practice of trafficking drugs into rural areas and smaller towns, away from major cities. Criminal gangs recruit and exploit vulnerable children, sometimes including children in pupil referral units and those who have been excluded from school, and exploit them to deal drugs. Some young people are recruited via debt bondage, whereby they enter county lines to pay off drug debts. The term county lines refers to the phone numbers, or lines, dedicated to this activity. The practice is also known by those involved as "going country" ("cunch") or "going OT" ("outta town"). Scale Between the years of 2018 to 2019, National Crime Agency figures showed there were 1,500 drug trafficking routes of this sort in the United Kingdom, rising to 3,000; in that year the agency estimated the total turnover of county lines activities throughout the UK to be roughly £500 million. A 2020 report for the Home Office by Professor Dame Carol Black states that the county lines drug trade involved 27,000 young people in the UK. The majority of county lines come from the Metropolitan Police service area taking 15% of the market, followed by the West Midlands Police area at 9% and Merseyside at 7%. Children are coerced and manipulated to join via the promise of big money. The level of violence increased significantly post-COVID in 2020. Causes In 2019, Sadiq Khan, Mayor of London, blamed cuts in police numbers for the rise of county lines gangs. Also in 2019, police said that they lacked the resources to tackle county lines. They mentioned cuts to youth services may have been a contributing factor. They mentioned it was difficult to get the funding. There is now a county lines operation unit run by the National County Lines Co-ordination Centre. Jointly run by the National Crime Agency and National Police Chiefs' Council, it opened in September 2019. It is thought that it has helped to find suspects and help victims of drug trafficking. A 2020 report for the Home Office by Professor Dame Carol M. Black traces the causes of the phenomenon to a combination of government cuts in youth services and drug recovery services, absence of parents, poor parenting, increased child poverty, school exclusions, and availability of purer forms of drugs. Furthermore, it has become evident that drug dealers target children in poor areas or children