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The company alleges in its lawsuit that the law deprives employers of due process on multiple fronts, including by forcing a company to enter a collective bargaining agreement even if it has formally appealed state labor board certification of a union vote and presented what it believes is evidence that the voting process was fraudulent.

What about the gold standard of teaching, National Board Certification?

Yet Dan Goldhaber, a professor at the University of Washington and one of the country’s preeminent researchers on teacher quality, found that board certification results in only modest gains to student learning — about five weeks’ acceleration in middle school math, at best.

“A pediatric neurosurgeon must have the appropriate training, board certification, and experience to provide care to pediatric patients,” it said in an email.

Singleton, 62, has a law degree, National Board certification as an instructor and 30 years of classroom experience.