the way I understand it- although I believe the other states were able to reach a compromise with their unions- the stumbling block may have been that they do not have pay for performance or subject matter, but collective bargaining.
Washington state law requires that teachers not be paid directly as NMSI wanted to do.
I have to admit- I think that does a disservice to the math and science teachers and to the students to lose this resource.
WA high schools lose $13 million grant for AP teachers | Education News | KING5.com | News for Seattle, Washington