Garcia is renowned for his roles in successful cases against corrupt politicians in Atlantic City, New Jersey; corrupt police officers in the Hollywood Police Department, the Broward County Sheriff's Office; Boston Police Department and in the San Juan, Puerto Rico Police Department. He has also worked undercover against hundreds of drug dealers and leaders of both Colombian and Mexican drug cartels, while posing as either a money launderer, transporter or trafficker. He has done undercover work on National and International terrorism cases as well as National Security investigations. Garcia has also worked undercover against Russian and Asian organized crime groups. Most remarkably, Garcia worked on many of these cases simultaneously, as he juggled his various undercover identities and roles. Garcia successfully managed to work as an undercover FBI special agent for 24 out of his 26 years of service without detection.