Any individual on a vessel subject to the jurisdiction of the United States who is found by the Secretary, after notice and an opportunity for a hearing, to have knowingly or intentionally possessed a controlled substance within the meaning of the Controlled Substances Act (21 U.S.C. 812) shall be liable to the United States for a civil penalty of not to exceed $5,000 for each violation. The Secretary shall notify the individual in writing of the amount of the civil penalty.

In determining the amount of the penalty, the Secretary shall consider the nature, circumstances, extent, and gravity of the prohibited acts committed and, with respect to the violator, the degree of culpability, any history of prior offenses, ability to pay, and other matters that justice requires.

Assessment of a civil penalty under this subsection shall not be considered a conviction for purposes of State or Federal law but may be considered proof of possession if such a determination is relevant.