More than 50 people have been arrested on suspicion of drug offences at the V Festival in Chelmsford.
Essex Police said 29 people had been arrested on suspicion of drug dealing offences and 22 for possession.
Five people have been charged, five issued cannabis warnings and 13 given cautions. No further action has been taken against two of those arrested. The remainder have either been released on bail pending further enquiries until dates in October and November 2012 or are still to be dealt with.