The state’s police oversight agency has declined a request from Karen Read ’s lawyer to investigate Boston’s police commissioner over comments he made about a witness in Read’s high-profile case.

In a letter sent Thursday to Read attorney Alan Jackson, the executive director of the POST Commission, Enrique A. Zuniga , said his agency lacks the authority to investigate Michael Cox, a civilian employee who does not personally carry out police functions.

Zuniga said the commission “thus far has not required non-sworn civilian executives such as Commissioner Cox to obtain law enforcement certification nor has the Commission treated them as being subject to other statutory and regulatory provisions governing sworn law enforcement officers.”

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However, Zuniga wr

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