The leader of Massachusetts’ police oversight board said it had no authority to investigate the commissioner of the Boston Police Department in a letter sent Thursday, weeks after a defense lawyer for Karen Read asked the body to begin one .

Alan Jackson, the defense lawyer, called for the investigation in a letter he sent last month. His letter came after email exchanges made public by Corri Hopkins, a lawyer in North Carolina who supported Read’s innocence online, showed Commissioner Michael Cox knew of his department’s connection to the Read case, despite remarks to the contrary .

In a letter provided to Boston 25 News , Jackson wrote that Cox was “caught in a lie — and not a small one.”

Jackson asked the Peace Officer Standards and Training, or POST, Commission to open an inve

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