Several Black Sox softball squad members tested positive for cannabis late last year.
The exact number of offenders is not known, but Fairfax Media understands the tests were conducted at a squad camp in Wellington in December.
The out-of-competition tests were instigated by team management to comply with High Performance Sport New Zealand's zero-tolerance drugs policy.
Fairfax understands the players who failed the test were re-tested in late January. All passed the second test.
Help was offered to the players. The Black Sox squad will be re-tested in March.
Softball New Zealand is expected to release a statement tomorrow.
Black Sox players are attending tonight's Halberg Awards where they are among the finalists for team of the year after their 2013 world championships win.
The previous Black Sox management introduced a zero-tolerance policy in 2010 and warned any player who breached it would be banned from the 2013 world championships.
That followed three leading provincial players testing positive for cannabis in 2009, one of them for a second offence.
Former Black Sox manager Doug Golightly told a 2010 coaching conference that
"Everyone in this room knows that our sport is mired in this illegal and sickening swamp, We are demanding that our Black Sox players are drug-free."
- Fairfax Media
Should Oscar Pistorius be allowed to compete again?