Police discovered and seized approximately £15,000 in class A drugs during a warrant executed in Watford.
Officers forced entry to an address in Francis Road at 7.30a on Thursday 17 August under Section 8 of the Police and Criminal Evidence Act.
They searched the property and found several packages containing cocaine and heroin.
Detective Inspector Chris Parperi, who leads the Watford Local Crime Unit, said: “This outcome is the result of a team effort between officers the Local Crime Unit, the Watford Scorpion Team, the Operational Support Group and the Bedfordshire, Cambridgeshire, and Hertfordshire Armed Policing Unit.
“This latest operation is part of our ongoing efforts to target and disrupt those involved in supplying Class A drugs in Watford.
“The violence and exploitation often associated with county lines networks causes untold harm to our communities and often targets the vulnerable.
“For that reason, we will not rest in our mission to seek out those who choose to supply and sell illegal drugs in our town.”
An 18-year-old man from Watford has been charged with two counts of possession with intent to supply class A drugs (cocaine and heroin).