Sen. John D. Rockefeller IV, West Virginia Democrat (left), talks with witnesses Dr. Jeffrey Kutcher, an assistant professor at the University of Michigan Department of Neurology; Steven Threet (center), a former Arizona State quarterback; and Alexis Ball, a senior at the University of New Mexico, before a hearing Wednesday on sports concussions and the marketing of protective equipment. (T.J. Kirkpatrick/The Washington Times)

Sen. John D. Rockefeller IV, West Virginia Democrat (left), talks with witnesses Dr. Jeffrey Kutcher, an assistant professor at the University of Michigan Department of Neurology; Steven Threet (center), a former Arizona State quarterback; and Alexis Ball, a senior at the University of New Mexico, before a hearing Wednesday on sports concussions and the marketing of protective equipment. (T.J. Kirkpatrick/The Washington Times)