Conn. Gen. Stat. § 12-407c
If any person described in subparagraph (E) of subdivision (12) of subsection (a) of section 12-407 is acting in concert with any person described in subparagraph (F) of said subdivision (12), the Commissioner of Revenue Services, in the commissioner's discretion, may deem and treat such persons as principal and agent, respectively, when the commissioner deems it necessary for the efficient administration of this chapter and may hold such persons jointly and severally liable for the collection and payment of the taxes imposed by this chapter. An unaffiliated person providing fulfillment services, as defined in subparagraph (C) of subdivision (15) of subsection (a) of section 12-407, to a purchaser of such services shall not be treated as a retailer by the commissioner under this section with respect to such activity.
Conn. Gen. Stat. § 12-407c
( P.A. 91-132, S. 3, 4; P.A. 00-227, S. 2; June Sp. Sess. P.A. 01-6, S. 64, 85; P.A. 02-103, S. 3.)