From The Kugel Law Firm -  Driving offenses associated with being "under the influence" extend beyond individuals who have consumed excessive alcohol or engaged in recreational drug use. In both New York and New Jersey, law enforcement officers can pursue DUI charges even if the substance present in your system is completely legal.

https://thekugellawfirm.com/can-you-get-a-dui-for-driving-on-prescription-medication/

The Kugel Law Firm

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