NRS 52.235 Original required.
To prove the content of a writing, recording or photograph, the original writing, recording or photograph is required, except as otherwise provided in this title.NRS 52.235
NRS 52.260 Record made in course of regularly conducted activity; affidavit required.
1. The contents of a record made in the course of a regularly conducted activity in accordance with NRS 51.135, if otherwise admissible, may be proved by the original or a copy of the record which is authenticated by a custodian of the record or another qualified person in a signed affidavit.
2. The custodian of the record or other qualified person must verify in the affidavit that the record was made:
(a) At or near the time of the act, event, condition, opinion or diagnosis concerning which the information was recorded, by or from information transmitted by a person with knowledge of the act or event; and
(b) In the course of the regularly conducted activity.NRS 52.260