Wes Welker has been suspended four games for use of amphetamines, sources told ESPN NFL Insider Adam Schefter.

Welker was excused from practice Aug. 20-21 to attend his appeal hearing, sources told ESPN Senior NFL Analyst Chris Mortensen.

Welker tested positive from a sample taken shortly after he attended the Kentucky Derby, according to sources. He argued that the sample was tainted.

ProFootballTalk reports that Welker took Molly at the Kentucky Debry that had been cut with amphetamines.