According to a release, Evans, who spent last season in a largely reserve role for the Indiana Pacers, violated the NBA/NBPA's Anti-Drug Program, which carries a dismissal and disqualification from the league.
Evans was slated to become an unrestricted free agent July 1.
Tyreke Evans #12 of the Indiana Pacers shoots the ball against the Boston Celtics in game four of the first round of the 2019 NBA Playoffs at Bankers Life Fieldhouse on April 21, 2019 in Indianapolis, Indiana. The team said it in a statement it would reach out to Evans to offer our support.
Evans played college basketball with the Memphis Tigers in the 2008-09 season.
Evans is eligible to apply for reinstatement to the league in two years.
7 broken Brexit promises the Tories want you to forget
Theresa May's Brexit deal will finally be dead if MPs reject it for a fourth time next month, the Brexit secretary has admitted. Mrs May addressed MPs at Prime Minister's Questions today after revealing MPs would vote on a Brexit deal again next month.
Evans averaged 10.2 points, 2.9 rebounds, and 2.4 assists in 20.3 minutes per game for in last season. The only precedents in recent years would be Chris Andersen and O.J. Mayo, who were both hit with the same punishment.
A player can be reinstated only with the approval of both the NBA and the players' association.
Evans sat out one game early in the season for violating team rules and issued an apology then for being late to practice.
The former Memphis Tigers star entered the league in 2009 as the Sacramento Kings' fourth overall selection.