I'm not sure if this will be an accepted source by all present (since it comes from a book), but here are the Colorado statutes:
Amazon.com: Colorado Rules of Criminal Procedure ("Just the Rules" Series) eBook: Colorado Supreme Court, Jimmy Verner: Kindle Store
...or they can be searched online here:
http://www.lexisnexis.com/hottopics/colorado/
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Additionally, according to University of Colorado law professor Mimi Wesson, under Colorado grand jury law, Hunter might not have had the statutory power to invalidate the indictment by refusing to sign it.
"I doubt that a judge would order a prosecutor to sign an indictment, but that's a different question from the validity of an unsigned indictment."
"The question of the prosecutor's obligation usually comes up when a defendant is indicted and arrested and arraigned and generally put in the path of a prosecution, and then tries to get the charges dismissed on the ground of the prosecutor's failure to sign the indictment."
"This has not come up in Colorado that I can discover, but in some other jurisdictions, these defendants have not been successful."
Wesson also pointed out that Rule 6.6 of the Colorado Rules of Criminal Procedure states that, "Presentation of an indictment in open court by a grand jury may be accomplished by the foreman of the grand jury, the full grand jury or by the prosecutor under the instructions of the grand jury."
Wesson also stated, "It seems to me that this rule suggests that
the grand jurors had the power to bypass the DA's Office and report to the court that they had returned an indictment. Of course, if they did not know they had this power, they might believe that they were powerless to act without the DA, and that they were bound to maintain secrecy."
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ETA one more source of information:
http://www.boulder-bar.org/bar_media_manual/index.html