CASES OF THE FBI

On March 27, 2026, a federal arrest warrant was issued for Carlos Alberto Páez Pereda, the alleged leader of Los Rugrats. In July, the Justice Department announced an indictment involving narcoterrorism, drug trafficking, and money laundering. The FBI’s San Diego Field Office participated in the investigation alongside the DEA, Homeland Security Investigations, and other agencies. This episode examines the official charges, the allegations surrounding the Sinaloa-to-California trafficking network, and the challenges of pursuing an international fugitive.

For nearly two decades, Karel Koecher maintained an American identity while secretly serving Czechoslovak intelligence. After an extensive counterintelligence investigation, the FBI arrested him and his wife in November 1984 as they prepared to leave the United States. This episode examines the investigation, the evidence of espionage, and the circumstances surrounding one of the Cold War’s most embarrassing American intelligence breaches. The Washington Post

Residents report prowlers, suspicious vehicles, and unexplained disturbances. Individually, the incidents appear minor. But when a violent crime occurs, investigators sometimes discover that earlier complaints may have been connected. This episode examines the importance of reporting, interagency communication, and identifying patterns without assuming every suspicious incident signals a serial predator.

During the early 1960s, Boston investigators confronted a series of murders that challenged conventional investigative methods. This episode examines the emerging role of behavioral analysis, interagency information sharing, and the difficulties of linking crimes across jurisdictions. We explore how investigators approached the case before modern forensic technologies could help resolve crucial questions.

In 1988, eight-year-old April Tinsley disappeared from Fort Wayne, Indiana, launching a murder investigation that would last three decades. As the killer taunted authorities with disturbing handwritten messages, investigators sought behavioral insights and forensic evidence to identify the suspect. This episode examines the role of FBI assistance, criminal profiling, and interagency cooperation in a case that seemed impossible to solve. Discover how advances in forensic genetic genealogy finally helped investigators identify John D. Miller in 2018.