Waiters reportedly took a "gummie", which is a THC edible, before the team's flight from Phoenix to Los Angeles on Thursday night.
On Sunday, the Heat suspended Waiters for 10 games without pay for conduct detrimental to the team.
The 10-game suspension, which will likely cost Waiters at least $834,483 in salary, began with Miami's loss at the Lakers on Friday (Saturday, PHL time).
On Friday night, Andy Slater, a host on 640AM South Florida, reported that a Miami Heat player had a medical emergency on the team's flight from Phoenix to LA.
Waiters has not played a game for the Heat this season.
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I told him I didn't have any thoughts about it, it needs some time to have a think about it. We'll call him and clear things up.
Waiters is in the third season of a four-year, $52 million contract he signed with the Heat in the summer of 2017. But that would seem most unlikely, and Waiters' future with the franchise is in serious doubt.
The Heat declined to comment.
That is obviously not going to happen. He's been in only 120 games with the Heat, missing many because of ankle injuries and surgery on his ankle and foot. The eighth-year player has either been listed as out with illness or a healthy scratch in every other game this season.
Although his numbers of slightly dipped, Waiters was known as an effective scorer and dropped major buckets for the Heat in preseason lay. Waiters was suspended for the team's opener on October 23, but has yet to play this season.
"There have been a number of instances this season in which Dion has engaged in conduct detrimental to the team".