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The time for a charge to be filed is determined by the appropriate statute of limitations which runs from the date of the offense and varies with the particular offense.
Utah Code 76-1-301, et seq.: Limitations of Actions
Capital felony, murder, manslaughter, none; other felony or negligent homicide: 4 yrs.; fraud or breach of fiduciary obligation, official misconduct: 3 yrs. max.; rape, sodomy, or sexual abuse of a child: within 4 yrs. of reporting offense; child abuse homicide, aggravated kidnapping, child kidnapping: none; violent felony: none if identity of perpetrator unknown but DNA evidence is collected and would identify the person at a later date (does not apply if statute of limitations has run as of May 5, 2003 without changes filed), once identification made, within one year if statute of limitations has run; misuse of public monies, falsification or alteration of public records, bribery: 2 yrs. after facts reported to prosecutor
2 yrs.; infractions: 1 yr.