The state Inspector General is probing the employment of a CUNY integrity expert whose multiple salaries apparently skirt state “double dipping” rules, The Post has learned.

The investigation comes after The Post exposed how the City University of New York was paying Vincent Green’s $164,114 salary as director of vendor integrity and investigations through its non-profit Research Foundation.

Since Green, who retired in 2010 from the city Department of Investigations, is also collecting a public pension of $91,000, he can’t earn more than $30,000 in state income without a waiver. By paying him through the non-profit, CUNY avoided asking for the waiver.

But his salary actually comes from taxpayer money — state funds that go to the Research Foundation.

A CUNY spokesman said the university had not been contacted by the IG’s office about Green.