Organized crime prosecutors and anti-drug police conducted four raids Thursday and detained four men, including two identified as U.S. citizens.
The detentions were the result of other arrests last year and last month of marijuana vendors.
The police agencies said that their agents located two hydroponic marijuana-growing operations, one in Heredia and one in Rohrmoser. They also found a stable that appears to be used as a storage place for marijuana.
The allegations also said that the men were distributing hashish, cocaine and LSD.
According to the Ministerio de Seguridad Pública, those detained were a Colombian, 28, with the last name of Mendoza; the two U.S. citizens, one with the last name of Kjar who is 31 and one with the last name of Zev, who is 44, and a Costa Rican with the last name of Sormani. He is 39.
Mendoza was detained at his apartment on Paseo Colón, said agents. The 44-year-old U.S. citizen was detained in Escazú, and the other U.S. citizen was detained in Los Ángeles de San Rafael de Heredia.
In June anti-drug agents said they began investigating a man who lived in Barrio Manuel de Jesús Jiménez, Cartago. He was detained in December. From there agents began to detain others involved in marijuana sales. That eventually led to the men detained Thursday who were identified as producers, they said.