An excerpt from the Glastonbury programme

Drugs
Drugs are as illegal at Glastonbury as anywhere else. If you buy, sell or use drugs you are likely to be arrested and ejected from the festival. Glastonbury is not a good place to take drugs and certainly not a place to start. Do not buy drugs at Glastonbury, they may have been mixed with other, more dangerous substances. Taking drugs could have harmful or even fatal results. Reassure anyone having a bad reaction.