19 U.S.C. § 1615

In all suits or actions (other than those arising under section 1592 of this title ) brought for the forfeiture of any vessel, vehicle, aircraft, merchandise, or baggage seized under the provisions of any law relating to the collection of duties on imports or tonnage, where the property is claimed by any person, the burden of proof shall lie upon such claimant; and in all suits or actions brought for the recovery of the value of any vessel, vehicle, aircraft, merchandise, or baggage, because of violation of any such law, the burden of proof shall be upon the defendant: Provided , That probable cause shall be first shown for the institution of such suit or action, to be judged of by the court, subject to the following rules of proof: (1) The testimony or deposition of the officer of the customs who has boarded or required to come to a stop or seized a vessel, vehicle, or aircraft, or has arrested a person, shall be prima facie evidence of the place where the act in question occurred. (2) Marks, labels, brands, or stamps, indicative of foreign origin, upon or accompanying mechandise 1 1 So in original. Probably should be “merchandise”. or containers of merchandise, shall be prima facie evidence of the foreign origin of such merchandise. (3) The fact that a vessel of any description is found, or discovered to have been, in the vicinity of any hovering vessel and under any circumstances indicating contact or communication therewith, whether by proceeding to or from such vessel, or by coming to in the vicinity of such vessel, or by delivering to or receiving from such vessel any merchandise, person, or communication, or by any other means effecting contact or communication therewith, shall be prima facie evidence that the vessel in question has visited such hovering vessel.