Accept Tau on AP tests

On 1/2 Tau day I would like to bring up the issue that college board refuses to accept tau as a standard constant, meaning 6.283185307.... While they allow you to define tau as 2 pi, they warn that this could lead to graders taking away points if they miss the definition. This would be a big victory to getting tau to be accepted. Currently,  some teachers do not allow students to use this notation because of this problem.

For information on τ:
tauday.com
http://www.youtube.com/watch?v=H69YH5TnNXI&feature=youtu.be
http://www.youtube.com/watch?v=jG7vhMMXagQ&feature=plcp&context=C440d07cVDvjVQa1PpcFMIQDBnlTaVU4iaZ546GL6gnY4PnS5CiZc%3D