The Drug Enforcement Administration proposes to revise and amend existing regulations to reduce overall inventories held by DEA-registered manufacturers and other registrants; to create use-specific subcategories for procurement quotas; and to clarify the current language and ensure that both manufacturers and distributors are required to obtain certification of a buyer’s quota for the requested schedules I and II controlled substances, as well as list I chemicals. These changes are necessary, in light of the increasingly complex controlled substances manufacturing business practices, to reduce the potential for the diversion of certain controlled substances.