  The County Lines Model (CLM) is a relatively new illicit drugs distribution
method found in Great Britain. The CLM has brought modern slavery and public
health issues, while challenging the law-enforcement capacity to act, as
coordination between different local police forces is necessary. Our objective
is to understand the territorial logic behind the line operators when
establishing a connection between two places. We use three different spatial
models (gravity, radiation and retail models), as each one of them understands
flow from place i to j in a different way. Using public data from the
Metropolitan Police of London, we train and cross-validate the models to
understand which of the different physical and socio-demographic variables are
considered when establishing a connection. We analyse hospital admissions by
drugs, disposable household income, police presence and knife crime events, in
addition to the population of a particular place and the distance and travel
times between two different. Our results show that knife crime events and
hospital admissions by misuse of drugs are the most important variables. We
also find that London operators distribute to the territory known as the
"South" of England, as negligible presence of them is observed outside of it.
