Children as young as 15 are being arrested for drugs offences in Batley, Birstall and Birkenshaw.
The detention of a 15-year-old was one of 23 arrests of under-18s in the past three years, figures released under a Freedom of Information request show.
Five of those arrests were for offences concerning Class A drugs – which cover crack cocaine, ecstasy, heroin and LSD.
Forty four arrests were made in Dewsbury and Mirfield – including one 13-year-old – from 2010-2012, and 17 were made in the Spen Valley.
Det Chief Insp Paul Jeffrey from Kirklees CID said: “We have put in a number of positive initiatives to educate children and young people about the dangers of drugs and the harm they can have on our communities.
He added: “I make no apology that our target and top priority remains those people who peddle in this miserable trade by either selling drugs or producing them (or both).”
The Base, CRI Kirklees, based in Huddersfield, helps people under 25 from across our district affected by drugs or alcohol.
Service manager Raj Ubhi said: “The best way to improve the health of the future generation is to promote healthy lifestyle choices at an early age where lifelong behaviours are often developed and get them to understand the implications of their behaviour.”