At the bottom of the BA article: "In the past, righthanders Jon Gray and Aaron Blair tested positive for Adderall before the 2013 draft. Phil Bickford tested positive for marijuana before the 2015 draft. In those three cases, the positive tests did not appear to significantly affect their draft stock. Because the tests are administered before the draft when the players are not professionals, they have not carried any post-signing penalties for the players."