Government scientists are being sent to the V Festival to analyse samples of so-called legal highs amid renewed warnings against taking the party drugs.
The Home Office is launching a national campaign highlighting the risks of legal highs including laughing gas, which was more widely used than powdered cocaine and ecstasy last year.
They are aiming to gather information about which new substances are available in the UK, and the latest Home Office annual report on the trends is due to be published today.
More top news
Cloud and patchy rain move eastwards throughout Monday
Former Australian cricketer Shane Warne has been cleared by police over an allegation he hit an adult entertainment actress.
A British national is believed to have died in Greece after apparently being attacked by a pack of stray dogs.