what is a blue flag in football?

What You Need To Know About The ‘Thin Blue Line’ Flag

The blue “flags” you sometimes see thrown onto the field during NFL games are actually blue bean bags. In short, these bean bags are used to mark a change in possession. These bags are thrown at the location the change of possession occurred. This allows the referees to have the location marked.

100-YARD INTERCEPTION RETURN! | On-Season Football Series | Game 1

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