The NAC was first published in 1980. Prior to this compiled publication, agencies kept their own records of adopted regulations. The Law Library can provide copies of historical versions of regulations, but if you are researching intent behind an adopted regulation or an amendment, you will need to contact the agency that adopted that regulation directly.
The NAC is updated periodically after new or amended regulations are filed with the Secretary of State. To read the text of a new or amended regulation before it is incorporated into the NAC, you can review the Nevada Register of Administrative Regulations, which is also part of the Law Library's collection. Please note, while the chapter numbers of the NAC correspond to the chapters in the Nevada Revised Statutes ("NRS"), the section numbers in the NAC do not correspond to the section numbers in the NRS.
A source note accompanies each section of the NAC and lists the agency that adopted the regulation, the effective date of the section, and the effective date of each amendment. For example:
[Att'y Gen., Form of Notice Reg. § 1.3, eff. 10-12-77] - (NAC A 8-20-90; 11-29-95; R138-97, 11-14-97; R050-14, 6-28-2016)
This section became effective in 1977 (before the NAC was published) and was amended in 1990, 1995, 1997 and 2016. The agency that adopted the regulation is the Attorney General.
Here is an example from NAC 341.015:
The historical note will always be at the end of each section. In this example, the Planning Board Policy, Procedures and Rules added this section in 1962; it was then amended in 1972, 1973, 1978, 1994, 2004, 2008 and 2012.
When a new amendment is published (anywhere from 1-6 times a year), the Law Library will receive the updated pages along with a letter of transmittal. The letter of transmittal, as seen in the illustration below, contains all relevant information for the amendment, including but not limited to:
Along with the amended and repealed chapters of the NAC, the Law Library also keeps a binder with all letters of transmittal.