| Business | Phone |
| Certified Polygraph Assoc 9212 E Montgomery Ave 503, Spokane 99206 | (509) 924-7400 |
| Charles R Delgado Polygraph 921 W Broadway Ave 205a, Spokane 99201 | (509) 328-1606 |
| Polygraph Intelligence Svc 222 W Mission Ave 232, Spokane 99201 | (509) 328-4698 |