Pretty black and white:
10 U.S. Code § 284 - Support for counterdrug activities and activities to counter transnational organized crime
(a)Support to Other Agencies.—The Secretary of Defense may provide support for the counterdrug activities or activities to counter transnational organized crime of any other department or agency of the Federal Government or of any State, local, tribal, or foreign law enforcement agency for any of the purposes set forth in subsection (b) or (c), as applicable, if—
(1) in the case of support described in subsection (b), such support is requested—
(A) by the official who has responsibility for the counterdrug activities or activities to counter transnational organized crime of the department or agency of the Federal Government, in the case of support for other departments or agencies of the Federal Government; or
(B) by the appropriate official of a State, local, or tribal government, in the case of support for State, local, or tribal law enforcement agencies; or
(2) in the case of support described in subsection (c), such support is requested by an appropriate official of a department or agency of the Federal Government, in coordination with the Secretary of State, that has counterdrug responsibilities or responsibilities for countering transnational organized crime.
(b)Types of Support for Agencies of United States.—The purposes for which the Secretary may provide support under subsection (a) for other departments or agencies of the Federal Government or a State, local, or tribal law enforcement agencies, are the following:
(1-6) different items are in these paragraphs and then this one
(7) Construction of roads and fences and installation of lighting to block drug smuggling corridors across international boundaries of the United States.
Proof libs can’t read!