Zackery Lystedt

While gaps persist, concussion safety laws enacted in all 50 states have had a positive effect, including a large increase in the number of 12-18 year olds seeking medical treatment for head injuries. But more works needs to be done, says a public health expert.

In May 2009, Washington State enacted the Zackery Lystedt Law, becoming the first state in the nation to enact a comprehensive youth sports concussion safety law. Forty-two states have since followed Washington's lead in passing strong concussion safety laws.