| Naics index | Naics index description |
|---|---|
| 561611 | Fingerprint services |
| 561611 | Investigation services (except credit), private |
| 561611 | Investigators, private |
| 561611 | Lie detection services |
| 561611 | Missing person tracing services |
| 561611 | Polygraph services |
| 561611 | Private detective services |
| 561611 | Private investigation services (except credit) |
| 561611 | Skip tracing services |
| 561612 | Body guard services |