Marilyn Marks, an activist who worries about the accuracy of vote-counting equipment, has finally won her court battle to inspect ballots cast in Aspen, Colorado city elections from 2009. See this story. On June 28, the Colorado Supreme Court said it will not review the State Court of Appeals decision that had said old ballots are public records.
The legislature had passed a bill this year, clarifying that old voted ballots are public records available for public inspection (with certain restrictions), but that had not ended the controversy over ballots from a past election. When the ballots are made available for public inspection, of course there will be no method for knowing which voter put any particular ballot in the ballot box.