NRS 175.221: Evidence.

1. In all trials the testimony of witnesses shall be taken orally in open court, unless otherwise provided by statute.

2. The admissibility of evidence and the competency and privileges of witnesses shall be governed by:

(a) The general provisions of title 4 of NRS;

(b) The specific provisions of any other applicable statute; and

(c) Where no statute applies, the principles of the common law as they may be interpreted by the courts of the State of Nevada in the light of reason and experience.