In what circumstances can an officer arrest someone without a warrant during a DUI traffic stop?

An officer can arrest someone without a warrant during a DUI traffic stop if they have probable cause to believe that the individual is driving under the influence. Probable cause is a legal standard that requires more than just a suspicion; it means that the officer has enough factual evidence to reasonably believe that a crime has been committed. In the context of a DUI stop, signs of impairment, erratic driving behavior, or the results of field sobriety tests may contribute to establishing this probable cause.

The ability to make an arrest without a warrant in these circumstances is grounded in the need to ensure public safety and uphold the law against impaired driving. This allows law enforcement to take immediate action when they suspect someone may be a danger to themselves or others on the road. Understanding this legal basis is crucial for recognizing the powers officers have during traffic stops, especially in situations involving DUI.