Williams won the 60 m at the USA Indoor Track and Field Championships in 2010, running a world leading and personal record time of 6.49 seconds, which set him up as a favorite for the 2010 IAAF World Indoor Championships. However, he was barred from competing at the championships after his sample from the US championships tested positive for Carboxy THC, a marijuana metabolite. He received a three-month suspension and his championship result was annulled.