In January 2018, Coffey conducted an independent survey of all 45 police forces asking if there had been an increase in violence connected to County Lines. Coffey campaigned for the children used and trapped in County Lines to be seen as victims, not criminals and for early interventions by agencies to prevent them becoming embedded in gangs. She also called for more use of the human trafficking and slavery laws, which carry heavy penalties against gangs who use children as drug mules.