jimpeel, my experience with drug interdiction ops was that while we (the Navy) might do boardings on the high seas, it was more likely that we'd carry a LE detachment for the actual boardings. In US territorial waters, we'd work in conjunction with the Coast Guard, and let them do the boardings. We were told this was due to posse comitatus.
I am not sure what grounds were used to bring in military hardware at Waco.
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