Fans at the 49ers - Seahawks game this Sunday night may notice a few additions to the crowds.
Or perhaps they won't!
That's because the game at the CenturyLink Field will have undercover officers dressed in opposing team jerseys to prevent excessive heckling.
A spokesman for the Seahawks says the undercover officers will be at all home games this season.
If a fan is kicked out they must complete a four hour online course and pay a $75 fee.
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