by Jeff Goodman

"Darrell Arthur and Mario Chalmers were sent home for violation of program policies," said NBA spokesman Tim Frank.

According to sources, Arthur and Chalmers' violations had to do with marijuana, and having women in their room on Tuesday night. The four-day event began Wednesday morning.

One NBA rookie said that NBA commissioner David Stern was livid. Sources indicated that both players will be fined $20,000, could be suspended and will have to repeat the rookie transition program next year.

"We haven't made a decision yet," Frank said of the fine and possible suspension. "We're still reviewing it."

Chalmers hit the huge 3-pointer against Memphis in the national title game that forced overtime and eventually helped the Jayhawks win the championship. The 6-foot-1 guard was taken by Minnesota with the 34th overall pick and dealt to the Miami Heat in exchange for a pair of 2009 second-round picks and cash considerations.

He recently signed a two-year guaranteed contract that will pay him $700,000 this season.

The 6-foot-9 Arthur was originally selected 27th overall by the New Orleans Hornets before being traded to Portland and then Houston in draft night deals. Memphis acquired his rights from the Rockets for Donte Greene and a 2009 second-round pick.

Arthur, who signed a multi-year deal with the Grizzlies, averaged 12.8 points and 6.3 rebounds last season as a sophomore at Kansas.