"The 19-year-old student, and son of former Scotland and British & Irish Lions fly-half Craig Chalmers, is alleged to have tested positive in a random drugs test while involved with Scotland Under-20s towards the end of last season.
The IRB, SRU and Melrose RFC all declined to comment on the case, other than to re-state their commitment to keeping rugby clean and disciplining players in line with the UK Sport and World Anti-Doping Agency (WADA) guidelines."