Authorities say 30-year-old Paul Lucente, of Kings Park, ran when cops pulled his friend over for crossing the center line on Route 25 in Smithtown.
Police say he left his son in the backseat and later surrendered.
As for the driver, police say 26-year-old Benjamin Laudonio, of Stony Brook, was under the influence of drugs.
They reportedly found heroin in the car.
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