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 ...

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 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 ...

During a horizontal gaze nystagmus, or HGN, test, police officers or drug-recognition experts have a suspect follow an item, such as a pen, with their eyes to determine if nystagmus, an ...

The test in question is called "horizontal gaze nystagmus." In the test, an officer asks a suspect to follow a pen, flashlight or other object with his or her eyes. The officer evaluates the eyes ...

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 ...

In the HGN test, officers move an object before the suspect's eyes to determine the degree to which the suspect's eyes can smoothly follow the object, to assess jerkiness of the eyes when held at ...

The Pennsylvania Supreme Court has affirmed a Superior Court ruling that a horizontal gaze nystagmus test provides sufficient evidence for probable cause and an arrest in DUI cases. In Commonwealth v.