The National Anti Doping Agency on Tuesday handed a four-year ban on Indian weightlifter Sanjita Chanu for failing a dope test last year. Sanjita had tested positive for an anabolic steroid -- Drostanolone Metabolite -- which features in the World Anti-doping Agency's (WADA) prohibited list, during the in-competition testing at the National Games in Gujarat in September-October last year.