This legislation, titled the "Stop the Cartels Act," seeks to significantly bolster the United States' efforts against drug trafficking organizations (DTOs) and human trafficking, primarily focusing on activities originating from Mexico and other Latin American countries. It mandates comprehensive intelligence assessments on DTO operations, their impact on security and migration, and their financial networks. These assessments will also cover human trafficking and smuggling routes to the U.S.-Mexico border, highlighting the intersection of these criminal enterprises. The bill requires the Director of National Intelligence to review and prioritize intelligence resources for these covered foreign countries, ensuring they are sufficient to address the threats posed. Furthermore, it places conditions on U.S. foreign aid to Mexico, stipulating that funds will be withheld until Mexico removes barriers to bilateral law enforcement cooperation and intelligence sharing. The Secretary of State is also directed to develop a plan for reestablishing regular U.S.-Mexico bilateral security meetings and to review past cooperation initiatives. A key provision authorizes the Secretary of State to designate foreign organizations as Special Transnational Criminal Organizations (STCOs) if they operate transnationally for illegal gains and threaten U.S. security. The bill specifically mandates the designation of several prominent cartels, including the Sinaloa Cartel and Jalisco New Generation Cartel, as STCOs, which triggers asset freezing and criminalizes material support to these groups. The Department of Homeland Security is also required to submit monthly reports detailing various migrant statistics at the border, including apprehensions, credible fear claims, and release types. To address domestic cooperation, the bill makes states and local governments ineligible for federal financial assistance if they violate federal immigration laws, restrict compliance with DHS detainers, or impede information sharing with federal immigration authorities. This aims to prevent the creation of "cartel safe harbor jurisdictions" within the U.S. The Secretary of Homeland Security will make annual determinations regarding these ineligible jurisdictions. Regarding border security and immigration, the legislation significantly alters policies concerning the detention of alien minors, allowing the Department of Homeland Security to detain them pending removal proceedings, overriding existing judicial decrees like the Flores settlement agreement. It prioritizes removal proceedings for these minors and families, setting a goal of 100 days for completion. The bill also redefines "credible fear of persecution" for asylum claims, making it more stringent, and renders certain aliens ineligible for asylum, such as those with felony convictions or prior removals. To support these changes, the bill authorizes the hiring of at least 500 additional immigration judges and corresponding support staff, as well as more U.S. Immigration and Customs Enforcement attorneys. It also establishes refugee application and processing centers outside the United States, including one in Mexico and at least three in Central America, where individuals from those regions must apply for refugee status. These centers will charge fees to deter frivolous applications and will sunset after a specified period. Finally, the bill repurposes federal drug program funding by significantly increasing the authorization for block grants for substance abuse prevention and treatment, raising it from approximately $1.9 billion to $3.9 billion for fiscal years 2025 through 2029. To offset this increase, it repeals several existing federal drug and mental health programs, consolidating funding into the larger block grant structure.