Detective Christopher Nichols stopped a red Jetta on northbound Route 17 for an unsafe lane change just before noon, Detective Sgt. Jason Liaban said.
After smelling the pot, Nichols deployed K-9 Ryker, who indicated drugs were inside the vehicle, Liaban said.
A search turned up marijuana and a .380-caliber Taurus TCP handgun, the sergeant said.
Brian Guerrero, 27, of Paramus, remained held Thursday night in the Bergen County Jail pending a detention hearing on drug and weapons charges.
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ALSO SEE: New evidence convinced a judge to order the release Thursday pending trial of a Maywood man in the death of a 19-year-old Bloomingdale woman during rough sex in her car.
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