Extremely common. It allows DA's to direct the investigation and make sure the evidence they will want to use should the case go to trial is properly preserved. It also helps to ensure that proper procedures are being followed by law enforcement. A DA doesn't want a defense lawyer to have a case thrown out because an overzealous law enforcement officer made a mistake - if the DA is involved in the investigation they have the opportunity to oversee law enforcement conduct and decisions.
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I don't know if it us common, but there is nothing wrong with it. DA investigators are, for all intents and purposes, law enforcement officers. They carry guns, badges and handcuffs. They also have the authority to arrest people. Most of them were cops on the local police department before they were hired by the DAs office.
DAs mainly use them to clear up some issues in cases that the police overlooked or did not know about. They also track down witnesses for trial.
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DA can facilitate warrants, & "discovery" especially where the justification is not a "slam dunk".
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It is very common for a DA to work closely with police. The DA will not really do any investigation on their own, they will consult with the detectives and in some instances direct them. As a defense lawyer I routinely go to the scene with my investigator to better understand the dynamics. Prosecutors do the same thing.