Peterson did not talk to the media after the suspension was announced, but Broncos coach Mike Shanahan said Peterson blamed a tainted supplement.
"Sometimes it's not a conscious mistake," Shanahan said. "Sometimes you take the wrong supplement and all of a sudden a guy might not know he's making a mistake and he makes one. It just takes one slip up."
Shanahan knew there wouldn't be any leniency from the NFL on the matter. Players who take supplements that contain banned substances still receive full punishment under the policy.
"You pay the price," Shanahan said. "You're responsible for what goes into your body. That's the bottom line."
Peterson was signed to provide depth last year, and played sparingly. His main value is his versatility - he can play end or tackle. But he doesn't seem to fit Jim Bates' new scheme that well, because he isn't exceptionally quick like most of the ends Bates employs, and he's not an enormous anchor for the middle, another staple of the defense.
CAMP CALENDAR: The Broncos report to camp on July 28, their first
practice is July 29. The Broncos travel to Texas for joint practices with
the Cowboys on Aug. 15 and 16.
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