A form of MDMA, known as Donkey Kong pills, is also a line of inquiry and Gwent Police are trying to trace Carson’s movements prior to his death.
Det Ch Insp Alun Davies: “Since the tragic events of Friday evening, our investigation team have been conducting many lines of enquiry to establish the circumstances surrounding the death of 13-year-old Carson Price.
“As a result, this morning, Thursday 18th April, specialist Gwent Police officers executed a warrant under the Misuse of Drugs Act, at an address in Pontllanfraith, Blackwood.
“A 14-year-old boy from the area has now been arrested on suspicion of supplying class A controlled drugs.
“He currently remains in police custody at Newport Central Police Station and will be interviewed with an appropriate adult as part of our investigation.”
Supt Nick McLain thanked members of the community for “support during this tragic time”.
“The information received from the public has been a vital part of the investigation,” he said.
“I would like to emphasise no-one has been charged with any offences and the investigation is still continuing.
“I’d like to ask the community to support our ongoing work and refrain from posting any comments on social media that may jeopardise the investigation.”