The Rugby Football Union has revealed that five Premiership players tested positive for recreational drugs last season.
The findings were published in the organisation's annual doping report on Tuesday.
The five players in question, who are granted the right to anonymity, will be offered access to "assessment, rehabilitation and counselling" by the RFU.
No suspensions have been issued, but each player has been given a 'first-strike' fine of £5,000.
There were two positive results form Methylhexanamine, one for Cannabis, one for Cocaine and one for Dianabol.
A total of 617 tests took place both in and out of competition during the 2012-13 campaign.