Cattle Tracking Tested to Protect Food. Why not. People are putting tags in pets and Mexico is “tagging” people.

The U.S. Department of Agriculture is trying to create a national network that would track, within 48 hours, every contact an infected animal has had in its life. The USDA says such tracking is necessary because it took only a single Holstein infected with mad cow disease last year to lead more than 30 countries to close their borders to U.S. beef.

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