Nev. Rev. Stat. § 179.485
The contents of any wire, electronic or oral communication intercepted by any means authorized by NRS 179.410 to 179.515, inclusive, must, if possible, be recorded on tape or wire or other comparable device. The recording of the contents of any wire, electronic or oral communication under this section must be done in such a way as will protect the recording from editing or other alterations. Immediately upon the expiration of the period of the order, or extensions thereof, such recordings must be made available to the judge issuing such order and sealed under the judge's directions. Custody of the recordings must be placed with whomever the judge directs. They must not be destroyed except upon an order of the judge issuing such order and in any event must be kept for 10 years. Duplicate recordings may be made for use or disclosure pursuant to the provisions of subsection 1 of NRS 179.465 for investigations. The presence of the seal provided for by this section, or a satisfactory explanation for the absence thereof, is a prerequisite for the use or disclosure of the contents of any wire, electronic or oral communication or evidence derived therefrom under subsection 2 of NRS 179.465.
NRS 179.485