The Drug Enforcement Administration, also known as the Drug Enforcement Agency or DEA, is an agency which is responsible for enforcing the federal controlled substances laws and regulations of the United States. They sometimes work with the Counter Terrorist Unit due to many terrorists and arms dealers being involved with the drug trade.
- Kevin Carroll
- Officer Sam Krugman - Undercover LAPD officer who coordinated with the DEA on a sting operation that resulted in the arrest of Frank Allard and his gang. (Day 1)
- Suzie Diver - Agent, San Antonio, Texas (Stories)
- Enrique Hinojosa - Agent, San Antonio, Texas (Stories)
- Jason Peltz (Trojan Horse)
- Richard Reed - Agent, Miami-Dade County Division (Findings at CTU)
- James Sofer - Director, Miami-Dade County Division (Findings at CTU)