First a few facts to begin with: Under New Jersey law, a patrolman or state trooper is permitted to legally arrest a motorist for drunken driving per N.J.S.A. 39:5-25. While police have the ability to take a driver into custody and charge him or her with DWI or drug DUI, the law is not without some limitations.
As New Jersey trial lawyers experienced in defending individuals accused of operating a motor vehicle while intoxicated, we know that the law allows a law enforcement officer to arrest a person for DWI-DUI without the need for a warrant if, and only if, the policeman has “probable cause” that the driver was operating his or her vehicle in violation of New Jersey law (specifically N.J.S.A. 39:4-50(a) and/or N.J.S.A. 39:3-10.13).
Probable cause usually exists when the totality of the facts and circumstances that are known to the officer makes it reasonable for that individual to believe that the subject of the arrest was operating his or her car while in an impaired condition, either by alcohol, doctor-prescribed drugs or illicit substances, such as marijuana, cocaine, meth or some other controlled dangerous substance (CDS).
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New Jersey DWI Lawyer Blog

