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SFST and Expert Testimony in DUI Defense
In 2019, the Colorado Supreme Court issued an order in Campbell v. Colorado. The ruling stated that a police officer must be an expert witness.
Prosecutors do this to permit discussion of horizontal gaze nystagmus (HGN). Officers observe HGN in one of the standard field sobriety tests during a DUI investigation. The opinion resulted in a change in the way DUI cases are litigated.