Dr. Karl Citek, a widely renowned expert in the field, evaluated the HGpeN and stated it is a “useful device for training law enforcement officers on how to conduct the HGN test”. The HGpeN is ...

The suspect must follow the pen with his eyes ... to about 30 years of federally funded research used to support the HGN test. The test particularly is effective against habitual drunken drivers ...

The purpose of the HGpeN is to provide a standardized instrument to Law Enforcement for the HGN test battery. NHTSA has stated “Officers do not have standardized instruments with which to ...

In the HGN, a person is expected to stand on the side of the road while an officer observes "the suspects' eyes as he follows a slowly moving object such as a pen." In the WAT test, a suspect is ...