conduct, within the exterior boundaries of the National Forest System, investigations of violations of and enforce
section 841 of title 21 and other criminal violations relating to marijuana and other controlled substances that are manufactured, distributed, or dispensed on National Forest System lands and to conduct such investigations and enforcement of such laws outside the exterior boundaries of the National Forest System for offenses committed within the National Forest System or which affect the administration of the National Forest System (including the pursuit of persons suspected of such offenses who flee the National Forest System to avoid arrest);