19 CFR 165.16: Referrals to Department of Commerce.

(a) When required. A referral is required if at any point after receipt of an allegation, CBP cannot determine whether the merchandise described in an allegation is properly within the scope of an antidumping or countervailing duty order.

(b) Referral. The referral may contain any necessary information available to CBP regarding whether the merchandise described in an allegation is subject to the relevant AD/CVD orders.

(c) Notice of referral. TRLED will promptly notify the parties to the investigation of the date of the referral.

(d) Effect on investigation. The time period required for any referral and determination by the Department of Commerce will not be counted toward the deadlines for CBP to decide on whether to initiate an investigation under § 165.15, whether to take interim measures under § 165.24, or the deadline to issue a determination as to evasion under § 165.27.

(e) Notice of decision. CBP will place the determination by the Department of Commerce on the administrative record of CBP's proceeding and will electronically notify the parties to the investigation.