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Quick Answer. Steps to conducting a criminal investigation include arriving at the crime scene, documenting the crime scene, processing the scene, and completing and recording the crime scene investigation, explains the National Institute of Justice.
Steps in the criminal justice process. Investigation of a crime by the police. The purpose of a criminal investigation is to gather evidence to identify a suspect and support an arrest. An investigation may require a search, an exploratory inspection of a person or property. Probable cause is the standard of proof required for a search.