"John Doe" DNA Warrants

When the name of an individual is unknown, a "John Doe" DNA warrant/complaint may be filed. The DNA profile of the perpetrator, provided by the evidence in the investigation, is used as the unique identifier, describing the defendant rather than providing his or her name. Such a filing prevents the running of the statute of limitations in serious violent crimes.

These are models of John Doe warrants (provided to the Denver District Attorneys Office by Norm Gahn):

Source: The Denver District Attorneys Office