Hoping to end decades of tension over the advancement of minority officers, the Boston Police Department plans to overhaul a promotion system that has been criticized for contributing to a lack of diversity in the department’s upper ranks. Commissioner Edward F. Davis is expected Thursday to send an e-mail to officers and command staff announcing a $2.2 million initiative to replace a written promotion exam used statewide with a testing system that could include interviews and other components designed to provide a broader measure of leadership and potential.
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