50 State Helmet Law Review
looking at it closer, that site is quite a few years old and seems like there is some confusion.
Federal Standard 218
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Standard 218 of the Federal Motor Vehicle Safety Standards governs the manufacture, testing and labeling of motorcycle helmets in the United States, and is adopted by reference in the Nevada motorcycle helmet law. This standard requires testing of a motorcycle helmet to ensure that it can withstand penetration and that the chinstrap will remain in place upon impact. The standard also puts in place a labeling system so that helmets meeting Standard 218 requirements can be identified.
Nevada Revised Statute 486.231 and 486.381
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Nevada Revised Statute (NRS) 486.231 requires drivers and passengers of motorcycles to wear "protective headgear." NRS 486.381 states that violations of NRS 486.231 requiring protective headgear is a misdemeanor.
Nevada Attorney General Opinion No. 2002-41
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Opinion 2002-41 was issued by the Nevada attorney general to the chief of the Nevada Highway Patrol to assist highway patrol officers and members of the public to identify motorcycle helmets that meet Nevada law. The opinion states that the presence of a "DOT sticker," or of a sticker from Snell Memorial Foundation or American National Standards Institute, is a reliable indicator that a helmet conforms with Nevada standards. The opinion further indicates that, if one of the aforementioned labels is not present, the highway patrol must contact the helmet manufacturer or the National Highway Transportation Safety Administration to definitively determine whether the helmet meets Nevada law.
Read more: Motorcycle Helmet Laws in Nevada | eHow.com
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