Replays showed Drummond throwing the ball off the back of Bulls center Daniel Gafford's head. Gafford also received a technical foul from the exchange, and Drummond was tossed after a review with 10:42 remaining in the third quarter.
The Pistons were down 63-52 at the time. Drummond finished the game with nine points and four rebounds - his first time all season being held below nine rebounds.
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