u.s. coastguard has been using force to detain vessels crew, and passengers for quite sometime, by hitting the vessels engines, and boarding the vessel.
you see not everyone is always narco, the feasibility of a vessel operator not knowing drugs are present is there. the possibility of persons having no involvement, or knowledge of drugs is a large one.
refugees, migrants, and trafficked persons would be witnesses, not co-conspirators.
a military naval group, attacking unmilitarized vessels in international water is a big deal, as in maybe a joint forces operation would detain and prosecute a sitting U.S. president, if this actually did happen.