The Department of Homeland Defense is investigating how the cow made it over the border.

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Cow linked to Canada
Records say animal entered U.S. in '01
By Andrew Martin, Washington Bureau. Tribune news services contributed to this report

December 28, 2003

WASHINGTON –– The first cow in the United States to be diagnosed with mad cow disease has been tentatively traced to a dairy herd in Alberta, Canada, U.S. agriculture officials said Saturday.

Canadian records indicated that the dairy cow in Washington state diagnosed last week with mad cow disease was in a herd of 74 animals shipped from Alberta into the U.S. at Eastport, Idaho, in August 2001, said Ron DeHaven, chief veterinary officer for the U.S. Department of Agriculture.