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12.04.180 - Concealed weapons prohibited without permit.
It is unlawful, within the unincorporated area of Clark County, for any person to carry upon his person a concealed weapon, not permitted in accordance with state law, of any description, including a knife with a blade of three inches or more, capable of being concealed, without first having received written permission therefor from the sheriff.
Autos are legal under state law, and the county code doesn't single them out, so I'd say yes.I'm guessing an auto under 3" blade length is fine.