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Medically....no. However, we try and preserve as much of the crime scene as possible. The real question is how dead was TM and what are the local protocols re: traumatic cardiac arrest. In our system we don't have to work blunt trauma cardiac arrests. We still have to work penetrating trauma such as GSW's or stab wounds unless there are obvious signs of death such as rigor/livor mortis, decapitation, out pouring of cranial contents, etc. The PD starting CPR doesn't really mean much. They have no way of assessing his heart rhythm or the extent of his injuries. If EMS got there and he was pulseless and apniec (not breathing) and showed asystole (flat line) on the cardiac monitor, they may not have had to work him. To assess GZ and sign him off may have taken a couple of minutes, especially if the cops helped him clean up to get a better look at his wounds. With the limited amount of info we have at this time, that's the best I can do without pure speculation.