You are right, but why can't the officer have a nurse draw the blood at the ER. They have two hours in most states to draw blood. It doesn't take two hours to get to the ER. And that officer is most likely going to go to the hospital anyways to interview the patient and most likely arrest them on suspicion of DUI. As for "handing any other evidence," I don't hand over evidence. If I have the victim of a shooting or stabbing, their clothes get cut off and left on scene or get cut off enroute and left on the gurney and is moved with the patient onto the ER bed. I never, ever leave anything of evidentiary value in my ambulance. Ever seen an ambulance get taped off at a trauma center/ER as a crime scene because the crew left evidence inside while they transfered care? I have and that rig sat out of service for hours while it was processed and photographed. That isn't likely to happen too often, but I don't take the chance. Bottom line is we are not police and are not part of the law enforcement community. I don't want to be involved in the chain of custody for blood and my job is to render medical care.