APA (American Polygraph Association) The APA continues to be the leading polygraph professional association, establishing standards of practice, techniques, instrumentation and training.
United Kingdom Professional Investigators Network Business network for private investigators and detectives in the UK. Directory for private investigation agency and detective agencies.
Stoelting Co.Since 1886, Stoelting Co. has been a leader in manufacturing superior instruments and assessments for basic scientific research and practice.
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