Forty-nine states have enacted a so-called Zackery Lystedt concussion safety law since May 2009. Wyoming has enacted a weak concussion safety law, and the high school athletic association in Arkansas has rules that mirror the concussion laws of other states..
On July 27, 2011, D.C. Mayor Vincent Gray signed into law the Athletic Concussion Protection Act of 2011,
adding the District of Columbia to the list of states that
have passed strong youth sports concussion safety legislation since May