From the 9/4/94 Montreal Gazette:

Rugged National Hockey League winger Bob Probert has been suspended indefinitely and will take part in treatment for substance abuse, the league announced yesterday. Probert, signed as a free agent by the Chicago Blackhawks this summer, will begin a rehabilitation program immediately, NHL commissioner Gary Bettman said in a news release. "We won't speculate on the time of his return to the Blackhawks," Bettman said.

Probert, 29, signed a four-year, $ 6-million contract with Chicago in August after being released in July by the Detroit Red Wings. He was involved in a motorcycle accident July 15 and charged with impaired driving. Blood tests by Michigan police showed Probert had a blood alcohol level of .31 per cent and also indicated the presence of cocaine in his system. Probert, who faces a hearing Sept. 9 on the accident-related charges, also faces a hearing Sept. 2 on charges he assaulted a woman in a Dallas bar last December.
(Source - TheSmokingGun.com)

Here's another link to the story.