Drug safety organisation The Loop was onsite at Y Not Festival in Derbyshire over the weekend and identified ecstasy pills pressed as Donald Trump as a potential health risk.
The Loop issued a warning on Twitter on Sunday afternoon, stating pills tested at the event contained over 250 milligrams of MDMA. This is over the average dose of one pill.
It issued a similar warning about pink 'Bitcoin' pills tested at Kendal Calling in Cumbria where Gorgon City, Mistajam, Grandmaster Flash and more played.
The Loop was also at MADE Festival in Birmingham on July 28 and is due to head to Bestival and Boardmasters this month.
For more on safe ecstasy use, head here.
Dave Turner is Mixmag's Digital News Editor, follow him on Twitter