UCLA School of Law professor Richard Sander stirred up a hornet’s nest in 2004 with a study suggesting affirmative action might be responsible for black students’ high failure rates on bar exams around the country.

Three years later, an undaunted Sander is poking the beehive again. This time he’s accusing the State Bar of California of caving in to liberal activists by refusing to work with him in possibly proving his unpopular premise once and for all. Sander said he had asked the State Bar to OK research using its historic data on past bar exam scores, including the race and academic credentials for each applicant, though not individual names.