Cheshire Jets guard John Simpson has had his contract terminated with immediate effect after he tested positive for marijuana.
Simpson was banned from playing during an UK Anti-Doping tribunal on Sunday.
"John has let himself and the club down and I know he regrets what he did," said club director Peter Hawkins.
"As a club we always strive to set the highest standards of behaviour and therefore had no hesitation in terminating John's contract."
The news comes after the Jets' 92-82 victory over the Leicester Riders on Sunday.
Cheshire were comfortable for most of the game and had a 20-point lead going into the final quarter thanks to 20 point hauls from Jerrah Young and Shawn Myers.
They stay above Everton Tigers in fifth place and have a game in hand on their local rivals.