1. Is the examiner professionally trained at a polygraph school accredited by the American Polygraph Association? Ask to see certification!
2. Has the examiner continued his/her education?
3. Does the examiner use up to date computerised instruments?
4. Is the company you use experienced? Have they been trading for many years?
6. Is the examiner a continuing member of either the American Polygraph Association or The British Polygraph Association, if they are then you can be certain than the examiner has received formal training in the field of Polygraph.