| Business | Phone |
| Advanced Polygraph Svc 603 W Main St # 4g, Knoxville 37902 | (865) 546-0569 |
| Volunteer Polygraph Svc 800 E Church Ave, Knoxville 37915 | (865) 335-8870 |
| Expert Polygraph Svc Po Box 24348, Knoxville 37933 | (865) 966-1494 |
| Jerry Richards & Assoc Llc 11044 Farragut Hills Blvd, Knoxville 37934 | (865) 966-1027 |