- Narcotic
- National Institute of Justice
- Navy Criminal Investigative Service (NCIS)
- NCIC (National Crime Information Center)
- NDIS, FBI Database
- Nerve Gas
- Nervous System Overview
- Neurotransmitters
- Nicholas Romanov
- Nicol, William
- Night Vision Devices
- NIST Computer Security Division, United States
- NTSB (National Transportation Safety Board)
- Nuclear Detection Devices
- Nuclear Spectroscopy
- Nucleic Acid Analyzer (HANAA)
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