Dan Seiler

dseiler's picture

Member Since


PCSOT Trained

PCSOT Trained

PCSOT Certification Date

Sat, 12/01/2012

The American Polygraph Association does not prescreen the biographies of its members.

Biography and Additional Professional Information


B.S. Degree in Criminal Justice, University of Baltimore, May, 1980. Major area of study in Jurisprudence. A.A. Degree in Law Enforcement, Anne Arundel County Community College. May 1976. Dean’s List, Member of National Honor Society. Diploma, June 1966, Andover High School, Linthicum, Maryland.


United State Marine Corp – Military Police Training, Andrews Air Force Base, 1969
Graduate of Baltimore City Police Academy, 1970
Graduate of Maryland State Police Academy, 1971
University of Maryland Law Enforcement Institute Crime Prevention Theory and Practice, National Crime Prevention Institute, Louisville, Kentucky.
Graduate, Basic Polygraph Technique, Md. Institute of Criminal Justice, 1983.
Graduate, FBI Advance Polygraph Training, Quantico, VA, May, 1986.
Various advanced Polygraph Training Seminars presented by the American Polygraph Association, Maryland Polygraph Association, Virginia Polygraph Association, Pennsylvania Polygraph Association and other Polygraph Associations Nation Wide..


September 1991 to Present: Private Polygraph Examiner, own and manage Cops, Inc., private detective agency.
July 1971 to October 1991, Maryland State Trooper
January 1983 to September 1991: Supervisor Sgt. and Polygraph Examiner for the Maryland State Police Western Troop.
Member of the State Police Hypnosis Unit.
Author of the Polygraph Applicant Screening Questions Technique.
Have run approximately 2500 polygraph examinations.


Instructor for Allegany County Community College - Criminal Justice
Presented Course of Instruction to the West Virginia State Police Polygraph Examiners on Applicant Screening.
Guest Instructor at the FBI Academy, Advanced Polygraph School.
Guest Instructor at the Maryland State Police Academy.
Certified Instructor with the Maryland Training Commission.


Member of American Polygraph Association
Member of American Association of Police Polygraphists
Past President and Life Member of Maryland Polygraph Association.
Member of the Virginia Polygraph Association
Member of Pennsylvania Polygraph Association


US District Court Charlottesville, VA. - Qualified as a polygraph expert
Maryland Circuit Court in Baltimore City, Howard and Washington Counties – Qualifed as polygraph expert.

201 Prospect Ave. #402
Hagerstown , MD 21742
Phone: 301 991 4381
39° 38' 30.3468" N, 77° 43' 11.9748" W
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