ST. LAWRENCE COUNTY, N.Y. -- Cincinnati Bengals running back Brian Leonard has been playing football his whole life and he knows firsthand how scary a concussion can be.
Leonard said, "In a daze, you're kind of lost, you don't know what's going on and sometimes you see stars. It's kind of a scary thing."
In recent years, doctors have looked more closely at concussions and more research has brought to light how serious they can be. With one concussion an athlete can suffer memory loss, nausea and vomiting. With a second, the effects are worse.
Many states, including New York, have worked on passing laws when it comes to the injury, but one big obstacle: Many athletes don't want to leave the game, regardless of how they feel.