According to Graham Allison in his book Nuclear Terrorism, what percentage of the 50,000 daily cargo containers to the United States are screened?

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According to Graham Allison in his book Nuclear Terrorism, less than 5% of the 50,000 daily cargo containers to the United States are screened. This means that there is a high likelihood that a nuclear weapon or material could potentially be smuggled into the country without detection.

According to Graham Allison in His Book Nuclear Terrorism, What