Inadvertent whistle should have ended play

The NFL admitted it made a mistake in how it handled an inadvertent whistle in the Redskins' 21-13 loss to Carolina at FedEx Field on Sunday. In the second quarter, Panthers running back DeAngelo Williams scored on a 30-yard touchdown run.

But line judge Thomas Symonette blew his whistle when Williams was at the 17-yard line. Linebacker Perry Riley pulled up on the play; he would have had a chance to tackle Williams or at least dive at him.

The officiating crew, led by referee Carl Cheffers, conferenced on the field and ruled the play a touchdown.

According to a statement released by the NFL, the play either should have been blown dead at the 17-yard line or Carolina should have been given the choice to replay the down.

"They had to admit that even if they didn't want to," Redskins coach Mike Shanahan said. "That was an obvious mistake."

Notes ยป Redskins receiver Santana Moss suffered a concussion in Sunday's loss, but there's no update on his status. The Redskins practice Tuesday but then will be off until Monday. He will be evaluated per NFL guidelines by an independent neurologist to determine when he can return. ...

Shanahan said he will not make any changes to his staff during the bye week. Defensive coordinator Jim Haslett has come under fire for his 28th-ranked unit. ...

Quarterback Robert Griffin III needed a pain-killing shot at halftime to deal with injured ribs. Griffin said Monday he was fine. ...

Shanahan said he's still not sure whether receiver Pierre Garcon will be available to play after the bye week. Garcon has played in only three games this season because of a sore foot/toe injury. Shanahan said he's more optimistic about safety Brandon Meriweather being available to play in his first game this season after the bye. Meriweather expressed optimism last week about returning for the Nov. 18 game vs. the Eagles.