He's had testing done numerous times and all have come back negative but the US Boxing commissions still feel he's a risk and often throw many road blocks to prevent him from fighting in their state. At least that's what I've read. You never know whats true and whats not these days.
No you don't, which of course is precisely why only a test and clean bill of health from the NYSAC will clear up the doubt surrounding Morrison. Until then, it's only natural that a lot of people are going to view this matter suspiciously.