Chiko Moyo, 18, was found in possession of 57 wraps of crack cocaine and 16 wraps of heroin in Anderson Park, Adamsdown.
Footage from National Police Air Service (NPAS) captures the moment Moyo, from Atlantic Wharf, Cardiff, was arrested.
It was a spontaneous arrest by plain-clothed officers who were patrolling the park as part of Operation Albarn.
The aim of the operation is to prevent and detect drug dealing in the Roath area, with a particular focus on parks.
Sergeant Frankie Baker from South Wales Police said:“Looking for and finding criminals is what we do every day, but a dedicated operation like this enables us to focus our efforts.
“We are committed to arresting drug dealers and keeping local parks safe and family friendly.”
Moyo was arrested at 10.30am on March 23. He was charged and later pleaded guilty at Merthyr Tydfil Crown Court to possession with intent to supply crack cocaine and possession with intent to supply heroin.
On June 9, Moyo was sentenced to 18 months in a Young Offenders Institution for each offence, to run concurrently.
Sgt Baker added: “This is a very sad path for anyone to be going down at such young age and I hope that Moyo can use the time in a young offenders’ institution to be rehabilitated.
“We urge parents, carers and teachers to speak to young people about the risks of getting involved in this kind of criminality.”
Operation Albarn is just one example of how we are tackling drug dealing in the community.
We can, and regularly do, act upon the information provided to us by the public, so please keep it coming.
Anyone with suspicions or information about illegal drug supply is urged to contact us.
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