Investigation Services
Key Figures
Figures are published for NAICS 561611 directly.
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Official definition
This U.S. industry comprises establishments primarily engaged in providing investigation and detective services.
Source: US Census Bureau, 2017 NAICS Definitions. Public domain.
Illustrative examples
- Fingerprinting services
- Private detective services
- Polygraph services
- Private investigative services
Which code does this activity belong in?
Investigation services establishments focus on uncovering facts and gathering evidence through investigative work such as fingerprinting, polygraph testing, and private detective services. These activities differ from security guards and patrol services, which protect people and property through direct surveillance and physical presence. Investigation services also differ from armored car services, which specialize in the secure transportation of money and valuables rather than fact-finding activities.