8 C.F.R. § 215.3
Alien whose departure is deemed prejudicial to the interests of the United States
The departure from the United States of any alien within one or more of the following categories shall be deemed prejudicial to the interests of the United States.
(a) Any alien who is in possession of, and who is believed likely to disclose to unauthorized persons, information concerning the plans, preparation, equipment, or establishments for the national defense and security of the United States.
(b) Any alien who seeks to depart from the United States to engage in, or who is likely to engage in, activities of any kind designed to obstruct, impede, retard, delay or counteract the effectiveness of the national defense of the United States or the measures adopted by the United States or the United Nations for the defense of any other country.
(c) Any alien who seeks to depart from the United States to engage in, or who is likely to engage in, activities which would obstruct, impede, retard, delay, or counteract the effectiveness of any plans made or action taken by any country cooperating with the United States in measures adopted to promote the peace, defense, or safety of the United States or such other country.
(d) Any alien who seeks to depart from the United States for the purpose of organizing, directing, or participating in any rebellion, insurrection, or violent uprising in or against the United States or a country allied with the United States, or of waging war against the United States or its allies, or of destroying, or depriving the United States of sources of supplies or materials vital to the national defense of the United States, or to the effectiveness of the measures adopted by the United States for its defense, or for the defense of any other country allied with the United States.
(e) Any alien who is subject to registration for training and service in the Armed Forces of the United States and who fails to present a Registration Certificate (SSS Form No. 2) showing that he has complied with his obligation to register under the Universal Military Training and Service Act, as amended.
(f) Any alien who is a fugitive from justice on account of an offense punishable in the United States.
(g) Any alien who is needed in the United States as a witness in, or as a party to, any criminal case under investigation or pending in a court in the United States: Provided, That any alien who is a witness in, or a party to, any criminal case pending in any criminal court proceeding may be permitted to depart from the United States with the consent of the appropriate prosecuting authority, unless such alien is otherwise prohibited from departing under the provisions of this part.
(h) Any alien who is needed in the United States in connection with any investigation or proceeding being, or soon to be, conducted by any official executive, legislative, or judicial agency in the United States or by any governmental committee, board, bureau, commission, or body in the United States, whether national, state, or local.
(i) Any alien whose technical or scientific training and knowledge might be utilized by an enemy or a potential enemy of the United States to undermine and defeat the military and defensive operations of the United States or of any nation cooperating with the United States in the interests of collective security.
(j) Any alien, where doubt exists whether such alien is departing or seeking to depart from the United States voluntarily except an alien who is departing or seeking to depart subject to an order issued in extradition, exclusion, or deportation proceedings.
(k) Any alien whose case does not fall within any of the categories described in paragraphs (a) to (j), inclusive, of this section, but which involves circumstances of a similar character rendering the alien's departure prejudicial to the interests of the United States.