Melrose player Sam Chalmers is to face allegations of doping at an IRB hearing this week.
The 19-year-old son of former Scotland stand-off Craig is alleged to have test positive for a banned substance while part of the Scotland under 20s squad.
A Scottish Rugby Union spokesman would not “confirm nor deny any reports naming any player with regards to a potential anti-doping adverse finding”.
He added: “Scottish Rugby takes a very clear stance on anti-doping and we have a zero-tolerance policy on doping offences in Scotland.
“We are committed to keeping the game in Scotland clean through a programme of robust drugs-testing coupled with education (both in person and online) on the dangers of illegal substances.
“Scottish Rugby, working in partnership with anti-doping agencies and other governing bodies, undertakes a programme of drugs-testing after-matches, after training, out of competition and at home.
“Testing can occur at any level of the game, anywhere and at any time.
“Players involved in representative rugby for Scotland receive a detailed briefing on anti-doping at the start of each season from team management and all players, clubs and schools are advised each season to ensure they are familiar with Scottish Rugby’s anti-doping policies and the latest information through our website.
“Since the 2009-2010 season there have been around 800 drugs tests in Scottish Rugby, at all levels of the game, conducted by UK Anti-Doping, the IRB, ERC and Six Nations and, in that period, there has been one adverse finding to date – an amateur club player in 2010 who was found to have taken a slimming product that contained an illegal substance.
“We are continuing to work diligently with all partners to ensure the importance of a drugs-free game is understood and advocated by all involved in the sport in Scotland.”
It would be the IRB rather than the SRU who would hand out any ban if Chalmers is found guilty.