| AIG | Assistant Inspector General |
| AO | Administrative Opinion |
| ASAC | Assistant Special Agent in Charge |
| ASCLAD | American Society of Crime Laboratory Directors |
| ATF | Bureau of Alcohol, Tobacco, Firearms and Explosives |
| ATR | Antitrust Division |
| BOP | Federal Bureau of Prisons |
| CIA | Central Intelligence Agency |
| DEA | Drug Enforcement Administration |
| DI | Deception Indicated |
| DoDPI | Department of Defense Polygraph Institute |
| DSS | Domestic Security Section |
| FBI | Federal Bureau of Investigation |
| FPM | Federal Personnel Manual |
| FY | Fiscal year |
| INC | Inconclusive |
| JCC | Justice Command Center |
| JMD | Justice Management Division |
| JTTF | Joint Terrorism Task Force |
| MAOP | FBI’s Manual of Administrative Operations and Procedures |
| MIOG | FBI’s Manual of Investigative Operations and Guidelines |
| MOA | Memorandum of Agreement |
| MSPB | Merit Systems Protection Board |
| NDI | No Deception Indicated |
| NDIC | National Drug Intelligence Center |
| NO | No Opinion |
| NSA | National Security Agency |
| NSR | No Significant Response |
| OEO | Office of Enforcement Operations |
| OIA | Office of Internal Affairs |
| OIAP | Office of Investigative Agency Policies |
| OIG | Office of the Inspector General |
| OII | Operations Support Division, Office of Internal Investigations |
| OLC | Office of Legal Counsel |
| OMB | Office of Management and Budget |
| OPDAT | Overseas Prosecutorial Development, Assistance, and Training |
| OPR | Office of Professional Responsibility |
| OPM | Office of Personnel Management |
| PDD | Psychophysiological detection of deception |
| SAC | Special Agent in Charge |
| SCI | Sensitive Compartmented Information |
| SEPS | Security and Emergency Planning Staff |
| SIU | Sensitive Investigative Unit |
| SOTP | Sex Offender Treatment Program |
| SR | Significant Response |
| USMS | United States Marshals Service |
| WITSEC | Witness Security |