Craig Chalmers says doping is ‘very common’ in rugby in wake of son’s ban

• Former Scotland fly-half: doping in rugby goes on, I know it goes on’• Sam Chalmers tested positive for anabolic steroids in May 2013• UK Antii-Dopiung chief worried by teenage steroid abuseThe former Scotland and British & Irish Lions fly-half Craig Chalmers believes doping is increasingly prevalent in rugby union and fears the authorities are not doing enough to address the issue in the wake of his son Sam’s positive test.Chambers junior returns from a two-year doping ban next month having tested positive for anabolic steroids when on Scotland Under-20s duty in May 2013 and subsequentl…