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50 USC Sec. 1520:
(b)(1) The Secretary of Defense may not conduct any test or experiment
involving the use of any chemical or biological agent on civilian
populations unless local civilian officials in the area in which the test
or experiment is to be conducted are notified in advance of such test or
experiment, and such test or experiment may then be conducted only after
the expiration of the thirty-day period beginning on the date of such
notification.