From the Congressional Research Service Central America report listed below.

Border Security: Additional Actions Could Strengthen DHS Efforts to Address Subterranean, Aerial, and Maritime Smuggling
U.S. Government Accountability Office, May 1, 2017.

GAO looks at the Homeland Security Department’s efforts to detect and curb these unorthodox methods of smuggling across the U.S.-Mexico border, all of which appear to have declined in frequency since 2011.

Central America Regional Security Initiative: Background and Policy Issues for Congress
Congressional Research Service, April 12, 2017

A regular update on U.S. assistance to Central America. This does not reflect the 2017 appropriation that became law on May 5.

Mexico: Organized Crime and Drug Trafficking Organizations
Congressional Research Service, April 25, 2017

A regular update on the main organized crime organizations and dynamics in Mexico, and the strategy being employed to confront them.

Explanatory Statement for Division J of P.L. 115-31, Consolidated Appropriations Act, 2017
U.S. Congress, May 5, 2017.

The narrative accompanying the 2017 State Department and Foreign Operations Appropriations bill. Here, Congress directs how a lot of foreign aid money should be spent. I pulled out 13 clips from this report, and 4 clips from the text of the law, that appeared relevant to U.S. security assistance to Latin America. See also the explanatory statement for the 2017 Homeland Security Appropriations bill from which I drew 2 clips (and 3 clips from the law).