Already at various border crossing points, customs authorities are having people who appear sick taken to a secondary inspection area for further evaluation.

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Another area of future improvement is the inspection of food that comes into the United States at its border, Doyle said.

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Investigators from the FBI and U.S. Postal Inspection Service in the Dallas-Fort Worth area in Texas hope that a reward announced Wednesday may help locate the individual who has now sent an estimated 380 white-powder envelopes since he first began his annoying practice in 2008.

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According to workers, there was a fight between workers and quality control inspectors in area K that led to the damage in inspection room CA, the injury of some people, and the hospitalization of others.

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Once these issues had been identified in the current inspection cycle, the firm further enhanced its mandatory guidance in this area.

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