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Academy of Polygraph Science

Providing all Phases of Polygraph Training

Instructional Staff


Gary F. Davis --- School Director


15 years as a Law Enforcement Officer. Serving with the Sedgwick County Sheriff’s Office, Wichita Kansas. Earned the rank of Detective Lt. supervising Criminal Investigations. Special Agent Kansas Bureau of Investigation serving in the Organized Crime Unit and Investigative Division as a Polygraph Examiner.


Graduate of Wichita State University with a Bachelors Degree in the Administration of Justice. Graduate of the Southern Police Institute, University of Louisville, and the University of Houston Polygraph Program.

Served as Chairman of the Kansas Board of Polygraphists, President and Charter Member of the Kansas Association of Polygraph Examiners, a 34-year member of the American Polygraph Association currently as Vice President Private, President and Life Member of the National Polygraph Association and Licensed as an Examiner in the states of Nebraska and Oklahoma. 


  • Over 30 years experience as a Clinical and Forensic Examiner.
  • Qualified as an Expert in Polygraph in the Courts of the States of Kansas and Missouri and in the United States District Court, Eastern District of Missouri.
  • Conducted thousands of polygraph and post conviction sex offender examinations. 

Bryant Crosby --- 


Bryant is a Licensed Private Polygraph Examiner in Nebraska, Tennessee and Iowa and conducts testing in Missouri and Kansas. He is a 2007 graduate of the Maryland Institute of Criminal Justice and since that time operates two successful polygraph companies. He conducts examinations for multiple U.S. and State agencies, members of the Criminal Defense Bar, Law Enforcement and the private sector.  


Graduate of Maryland Institute of Criminal Justice

M.A. in Forensic Psychology

B.S in Investigations 


Bryant holds a M.A. Forensic Psychology and B.S. Investigations. He served more than 26 years active duty in the U.S. Air Force (USAF) in various roles, culminating as a Group and Unit level Senior Enlisted leader. At various points in the USAF, he was a Program Director and instructor for base level professional development courses. As a polygraph examiner, he has briefed and provided presentations to multiple colleges and professional organizations. He is a current member in the American Polygraph Association, National Polygraph Association, American Psychology-Law Society, Association for Treatment of Sexual Abusers and several other organizations.


Contact Us

Tel: (630) 860 - 9700

E-mail: [email protected]

Fax: (630) 860 - 9775

APS Polygraph School

Mailing address only:

620 Wheat Lane, Wood Dale, IL 60191