Probable cause is a legal standard used when assessing the basis for a DUI allegation. The video describes it in everyday terms as whether the available information supports the conclusion that impaired driving occurred.
That assessment considers the totality of the circumstances rather than one fact in isolation. Driving behavior, performance on field sobriety tests, and a breath test result may all be part of the picture.
Reviewing those circumstances is an important part of evaluating the basis for an arrest and the evidence in a DUI defense case.