At 7.42pm on Friday 19 June Cheshire Police responded to a call of concerns for the welfare of a 15 year-old boy who had collapsed at Whitby Park in Ellesmere Port.
Emergency services attended and the boy was taken to the Countess of Chester Hospital for treatment.
Following initial police enquiries it is believed that the boy had taken a 'legal high' called Black Mamba.
Detective Inspector Simon Newell said:
"I am urging people to not take any so-called 'legal highs' and consider the risk. Although the drugs are given the name 'legal high' it doesn’t necessarily mean they are safe to take.
"I would also encourage parents to have a conversation with their children and warn them of the dangers posed by taking these drugs."
Reports also suggest that others within the group may have been suffering from adverse effects of taking the drug and may have become unwell around the same time, although not to the same extent.
If people have taken this or any other substances and have concerns about their health they should call 999 and seek immediate medical assistance."