Toronto Raptors center Jontay Porter could be booted from the NBA for LIFE if the league finds the gambling allegations made against him are true ... with commissioner Adam Silver calling the bombshell accusations a "cardinal sin."
Porter -- who hasn't played since the claims were made public last month -- has been under fire over two games in particular this season ... when sportsbooks noticed some head-scratching activity on prop bets involving the big man.
The 24-year-old left both games early due to either injury or illness .