On the phone was the league office, notifying Chandler he had tested positive for Ipamorelin, a growth hormone that has been on the NBA’s list of banned substances since 2016. Chandler had spent the summer rehabbing from a quadriceps injury sustained during the 2018-19 season. During his treatment, Chandler said, his personal physician gave him “small doses” of the drug. He added that neither he nor his doctor was aware he was taking a banned substance. “I was trying to get healthy, and I took something I didn’t know was a bad substance,” Chandler said. “I felt a lot of shame.”