During the time that an investigation is before an Administrative Law Judge, the Judge can issue a subpoena. The procedures involved in the issuance of subpoenas at the Commission differ from the current practice of most courts. The Commission Rule concerning subpoenas, including motions to quash, is found at Rule 210.32, 19 C.F.R. § 210.32. Note that an application for issuance of a subpoena, as well as the requested subpoena itself, must be submitted to the Administrative Law Judge.

Additional instructions concerning subpoenas may be given by the presiding Administrative Law Judge in a particular investigation (e.g., in the Ground Rules issued in a particular investigation). Subpoenas are enforced, if necessary, by the Commission in federal court.