Nevada's handbook sets a blood-concentration threshold for marijuana. Above what level does it say driving is unlawful?

The manual sets the marijuana limit at two nanograms, not one. This answer assumes Nevada follows a zero-tolerance drug rule where any measurable trace triggers a DUI, rather than a specific per se figure set at a whole nanogram higher.

Five nanograms is the manual's threshold for marijuana metabolite, not for marijuana itself. This answer recalls the five-nanogram THC per se figure that several other legalized-cannabis states use, rather than the tighter number Nevada sets for the parent drug.

Ten nanograms is not the marijuana threshold stated here; the handbook gives two nanograms per milliliter for marijuana and five for marijuana metabolite. This answer doubles the five-nanogram metabolite figure on the intuition that the parent drug should carry the larger cap, when Nevada sets it the other way around.