; (3) shall be fined under this title, imprisoned not more than 30 years, or both, if the violation caused serious bodily injury to any person; or (4) shall be fined under this title, imprisoned for any term of years or life, or both, if the violation resulted in the death of any person. (d) Attempt and conspiracy Any person who attempts or conspires to commit any offense under this section shall be punished in the same manner as a person who completes the offense. (e) Forfeiture Any property, real or personal, constituting or traceable to the gross proceeds of the offense and any property, real or personal, used or intended to be used to commit or facilitate the commission of the offense shall be subject to forfeiture. (f) Forfeiture procedures Seizures and forfeitures under this section shall be governed by the provisions of chapter 46 (relating to civil forfeitures), including section 981(d), except that such duties as are imposed upon the Secretary of the Treasury under the customs laws described in that section shall be performed by such officers, agents, and other persons as may be designated for that purpose by the Secretary of Homeland Security or the Attorney General. Nothing in this section may be construed to limit the authority of the Secretary of Homeland Security to seize and forfeit motor vehicles, aircraft, or vessels under the Customs laws or any other laws of the United States. (g) Definitions For purposes of this section— (1) the term checkpoint includes any customs or immigration inspection at a port of entry or immigration inspection at a U.S. Border Patrol checkpoint; (2) the term law enforcement agent means— (A) any Federal, State, local or tribal official authorized to enforce criminal law; and (B) when conveying a command described in subsection (b), an air traffic controller; (3) the term lawful command includes a command to stop, decrease speed, alter course, or land, whether communicated orally, visually, by means of lights or sirens, or by radio, telephone, or other communication