BOSTON (CBS) — Does Julian Edelman actually have a chance to win his appeal of the four-game suspension he’s facing for a positive PED test? According to MMQB’s Albert Breer, it would seem as though it’s possible.

Breer reported Monday that Edelman’s positive PED test “was triggered by a substance that wasn’t immediately recognizable.” Breer added that scientists are currently analyzing the test results to try to reach a determination.

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Though Edelman has not said much since news of the suspension broke on Thursday, he did release a short statement on Friday, in which he said “I don’t know what happened” with regard to the positive test.

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The 32-year-old receiver is working himself back after suffering a torn ACL last August in a preseason game in Detroit. Edelman had been coming off a career-high 1,106 receiving yards in the 2016 season, a year that ended with Edelman making a miracle catch to help the Patriots win Super Bowl LI over the Atlanta Falcons.

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The list of players who have won their appeals is short, but it is possible. Most notably, Richard Sherman — at the time a cornerback on the Seattle Seahawks — had his PED suspension overturned after it was revealed that the test collector improperly handled the sample.