C.R.S. § 1-13.5-702: Judges to inspect machines - when.

The election judges of each polling place at which voting machines are used shall meet at the polling place at least forty-five minutes before the time set for the opening of the polls at each election. Before the polls open for an election, each judge shall carefully examine each machine used in the polling place and see that no vote has been cast and that every counter, except the protective counter, registers zero.