Quincy often undertakes actions which would result in evidence and investigations being compromised. Since he is only a coroner and has never been a police officer, these actions could result in cases being dropped or overturned upon appeal. There is no way that a District Attorney would allow Quincy to perform the actions that he does in the show.
In the typical opening title sequence, near the end of the credits, there is a scene showing Quincy walking along talking his friend on the beach with people (extras) throwing a football in the background. As the ball is thrown toward the camera it passes off the screen to the left. Moments later a woman with a pink top and blue skirt stumbles into frame grasping her face and eyes. Her companions rush to her aid as she tries to brush sand or grit from her face. She is in obvious distress as is see by everyone's actions toward her, all except Quincy who obliviously walks on toward the camera continuing the scene. This was kept in the opening credits which is odd given that it is made up of snippets.