The security ministry has graduated 27 members of the Policía de Fronteras who completed a course taught by members of U.S. Customs and Border Protection.
The course began in September.
Topics included investigation of dubious documents, physical conditioning and border inspections.
The students were some who graduated from a basic course at the Escuela Nacional de Policía earlier this year.
The U.S. agency has been involved in such courses since 2010 under the regional security initiative.
The ministry continues to beef up its border security and officials have been embarrassed recently by disclosures that helicopters have been transporting drugs from this country to the north. Police managed to locate some of the secluded landing spots and make some arrests.
The drugs appear to have been brought into Costa Rica by fastboat and transported by air from the Limón area to staging locations in the northern part of the country where the crafts were refueled.