Arnold: What can policy do? Protect civil rights, scale effective practices, seed promising practices, require or prohibit or incentivize behavior, drive research and design, etc.
He's sharing a pyramid with federal policy at the top and students/faculty at the bottom, with information and advocacy going up the ladder and policy going down. (I'm oversimplifying.)
"If there are policies that are constraining your efforts, those are limits that no one else but you will know about."