Conn. Gen. Stat. § 12-34c
(a) The Commissioner of Revenue Services may enter into agreements with other states providing for reciprocal enforcement of the tax laws of the states entering into such reciprocal arrangements. As used herein, “state” shall include the District of Columbia. The provisions of such reciprocal arrangements may include, but are not limited to, the following:
(P.A. 88-223, S. 1, 2.)