No connection to the car's systems is needed; so nothing in the car is likely to help. Not in the sense of a "check engine" idjit light, anyhow. "sniffer" senso

No connection to the car's systems is needed; so nothing in the car is likely to help. Not in the sense of a "check engine" idjit light, anyhow. "sniffer" sensors for explosives exist, but they don't cover all the possible chemicals and your car carries a good amount of potentially explosive fuel with it anyway.