The wave of pipe bombs addressed to prominent Democrats has raised fresh questions about the ability of the U.S. Postal Service and private delivery companies to intercept explosives and other dangerous items.

Biohazard detection, X-rays and other technologies have had some notable successes in recent years, but officials warn that the sheer volume of mail makes it impossible to catch everything.

This image obtained Wednesday, Oct. 24, 2018, and provided by ABC News shows a package addressed to former CIA head John Brennan and an explosive device that was sent to CNN’s New York office. The mail-bomb scare widened Thursday as law enforcement officials seized more suspicious packages. (ABC News via AP)

David Chipman, a retired agent with the Bureau of Alcohol, Tobacco, Firearms and Explosives, says it’s not like going through an airport security checkpoint.

Source: The Associated Press

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