Customs inspectors charge Edwin Fuller had nearly a ton of pot hidden under the trailer's floor boards.
Authorities say Fuller was hauling cattle across the U.S.-Canada border, when X-rays showed there was something fishy about the trailer.
A statement from U.S. Customs and Border Protection says officers had to scrape off "the natural byproduct of cows" and unbolt the false panels.
Authorities report they found hundreds of plastic bags containing about 1,700 pounds of the illegal weed.
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