Lawsuits, lawsuits, lawsuits. 10 - 15 years ago they didn't have the technology we do today, they also didn't have all the little loopholes or questions or evidence that investigators have learned from experience that will arise when the investigation is concluded. Someone died, that person's family has been changed forever. Accidents are inconvenient for everyone, so are medical emergencies, illnesses, etc. These incidents can ruin people for the rest of their lives, reputations and determining correct responcibilty and just as important as to find out if there was anyway to prevent future accidents. Once evidence or a scene is compromised then there is no going back. If this was you driving, your loved one, or your company you would want to know that investigators and rescue personnel did everything in their power to determine what was best for all people involved. Accidents slow everyone down, but so do frivolous lawsuits and legal bs.