There has been much discussion about whether votes in this next election will be counted securely.

Every state has rules about what poll observers can do at the polls and how votes can be challenged. Here are the rules for your state:

Nevada The county clerk shall allow members of the general public to observe the conduct of voting at a polling place. A member of the general public does not include any person who: gathers information for communication to the public; is employed or engaged by or has contracted with a newspaper, periodical, press association, or radio or television station; and is acting solely within his or her professional capacity. (Nev. Rev. Stat. § 293.274). 

A person applying to vote may be challenged orally by any registered voter of the precinct upon the ground that he or she is not the person entitled to vote as claimed or has voted before at the same election. (Nev. Rev. Stat. § 293.303).