A detective/investigator needs a good foundation including experience and knowledge of Federal, State, and Municipal laws. He must also respect and adhere to Constitutional and Civil Rights. Additionally important is the understanding of Case Law which are decisions upheld by the Supreme Court. These are the tools needed to conduct an investigation. Detectives solve cases by processing information. It begins at the crime scene by documenting and gathering evidence and leads to the long process of interviewing victims, witnesses, and suspects, All the information is put in chronological order and analyzed to plan a strategy. At this point, it is essential to maintain an open mind and avoid focusing on just one scenario or suspect. All other avenues need to be explored and eliminated before coming to a conclusion. Next, he prepares affidavits for search warrants. Finally, the detective takes the case to the District/County Attorney for review. If the attorneys agree with the investigation, the detective can move forward and make an arrest.
Daniel Pastre, author of Justice and Closure