((a)) ** .—** A forfeiture under this chapter may be enforced in the same way as a forfeiture under the laws on the collection of duties. However, such a forfeiture may be remitted without seizure of the vessel.

((b)) ** .—** In a proceeding under this chapter to enforce a forfeiture, a prior criminal conviction of a person for a violation of this chapter with respect to the subject matter of the forfeiture is prima facie evidence of the violation against the person convicted.