MARYLAND
| Apex Investigative Services, Inc. | 1916 Crain Highway South, Suite 11 |
Glen Burnie | MD | 21061 | 800-860-1161 | wleighton@apex-investigations.com |
| Ardent Investigations | 2422 Pinefield Rd. | Waldorf | MD | 20601 | 888-882-7703 | ardentpi@comcast.net |
| Castle Security Group | 809 Frederick Rd. | Baltimore | MD | 21228 | 410-788-7800 | dbuck@castlesec.com |
| Haole & Kanaka & Associates | P.O. Box 5 | Lanham | MD | 20703 | 800-297-8330 | wvain@haole-kanaka.com |
| Prudential Associates | 11 N. Washington Street, Suite 350 | Rockvillle | MD | 20850 | 301-279-6700 | PI@usainvestigators.com |
| The Premier Group | 9516 Odelton Court | Laurel | MD | 20723 | 301-483-6067 | sjspi@aol.com |