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In 1982, GAO reported that illegal and unauthorized activities, including crimes against persons and property and marihuana cultivation, were limiting the ability of the public to use and enjoy natural resources and recreational facilities on federal lands. Pursuant to a congressional request concerning the danger imposed by marihuana growers, GAO updated its previous work focusing on the extent of marihuana cultivation, its effects on the management and use of federal lands, and the actions taken to eradicate marihuana.

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