MUMBAI, July 26 (Reuters) - Indian shot putter Inderjeet Singh said on Tuesday he has been notified by the national anti-doping agency (NADA) that he has returned a positive test for banned substances in his A sample. Inderjeet, who won the gold medal at the Asian Athletics Championships in 2015, told local television he had been informed of the test late on Monday and that all his earlier tests had been negative.