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:
Colorado Each participating political party or issue committee whose candidate or issue is on the ballot, and each unaffiliated and write-in candidate whose name is on the ballot for a general or congressional vacancy election, is entitled to have no more than one watcher at any one time in each voter service and polling center in the county and at each place where votes are counted. The chairperson of the county central committee of each major political party, the county chairperson or other authorized official of each minor political party, the issue committee, or the write-in or unaffiliated candidate shall certify the names of one or more persons selected as watchers on forms provided by the county clerk and recorder and submit the names of the persons selected as watchers to the county clerk and recorder. (Colo. Rev. Stat. § 1-7-106; 1-7-108).
An election judge shall challenge any person intending to vote who the judge believes is not an eligible elector. In addition, challenges may be made by watchers or any eligible elector of the precinct. (Colo. Rev. Stat. § 1-9-201;also see 1-9-203).