Cole Green, who pitched for the Billings Mustangs this season, has received a 50-game suspension for a violation of the Minor League Drug Prevention and Treatment Program.
The Office of the Commissioner of Baseball announced Green's suspension, as well as those of Baltimore Orioles' minor-leaguer Rhyne Hughes and Colorado Rockies' minor-leaguer Randol Rogers, on Wednesday.
Green, a right-handed pitcher who compiled a 4-1 record with a 4.24 ERA with the Mustangs, tested positive for Methylhexaneamine. Although intended for use as a nasal decongestant, Methylhexaneamine is also used as a general purpose stimulant.
Hughes tested positive for an amphetamine, while Rogers tested positive for a metabolite of Boldenone.
Suspensions for all three players will be effective at the start of next season.