A Waikoloa man found slumped over in the driver’s seat of his vehicle with the motor running has been charged with drug and weapon offenses after police seized heroin, methamphetamine, pharmaceutical pills and a switchblade from the sport utility vehicle.

Kona patrol officers said they received a call at 8 p.m. Friday from a concerned citizen in Kailua-Kona about a car that had been parked with the engine running for two hours. In the parking lot of a business on Henry Street, officers found Derek Conway, 39. After waking him, officers said, Conway appeared to be under the influence. Officers also reported finding drug paraphernalia in the vehicle.

Conway was arrested and taken to the Kona police cellblock, and when a search warrant was executed Saturday morning, officers said they found 40.7 grams of suspected heroin, 2.8 grams of suspected methamphetamine, 26 diverted pharmaceutical pills, a switchblade and $4,457 in cash in the vehicle.

Conway was charged late Saturday afternoon with operating a vehicle under the influence of an intoxicant; first-degree promotion of a dangerous drug; four counts of third-degree promotion of a dangerous drug; and one count each of fourth-degree promotion of a harmful drug, possession of drug paraphernalia and possession of a prohibited switchblade.

Bail was set at $112,000. Police said Conway was released Sunday after posting bond.