Searched: A slew of permutations of EMT + forensic + police + victim + homicide + suspect, evidence collection guidelines, etc.
I'm trying to figure out how the police and the EMTs would handle an injured Suspect at a homicide scene. He is sitting on the ground nearby in deep psychological shock, and mostly catatonic except for flinching/scrambling away from anyone who approaches him. He is visibly injured - bleeding from a gash on his head, and some form of unseen wound on one shoulder is bleeding profusely, and there is redness/bruising around his wrists and neck, too.
Additionally, the police know him - he is the Sheriff's son, and the dead guy had threatened to kill the Sheriff in front of the entire police department; he was technically supposed to be in jail, in fact, and had escaped a few days previously, and is already well-known for having a violent temper. In short, as soon as the police see who the victim and the Suspect are, they immediately (and correctly) believe this to be a case of self-defense/justifiable homicide, though they will obviously go through all the correct procedures, and will stick to the rules as much as possible to avoid accusations of bias.
1.) I have, written right now, an EMT at the scene, as well as a crime scene investigator/detective (I'm honestly not even sure which it would be - this is a small town that rarely sees violent crime, but when it does there is an awful lot all at once). Anyway - would collecting blood off the Suspect - who is covered in it, almost all of it the dead guy's - take precedence, or would treating him for his injuries do so? How would they handle the Suspect - would the investigator attempt to gather evidence from the suspect at all (i.e. collecting blood from the Suspect's skin to confirm that it's the dead guy's, check for other evidence of defensive wounds, etc.)? Or, would he not approach the Suspect at all and let the EMT treat him? If treating him takes precedence, would they be willing to wait for him to calm down/wait for someone to come in and calm him down, or would they just man handle him/sedate him and take him to the hospital?
2.) When the Sheriff shows up, will he be allowed to approach his son to try and calm him down/talk him into letting the other people approach him? If he touches his son (to help him stand up and basically carry him out of the room), would that be considered evidence tampering or otherwise be something he's not supposed to do? And when attempting to calm him down doesn't work, would they just sedate the suspect to be able to get evidence/get him to a hospital, or would they do something else? I mostly just need to be conscious at the start of the scene, but unconscious and taken to the hospital at the end.
3.) This is going to end as an open and shut case - there is surveillance footage showing the dead guy was trying to kill the Suspect, the Suspect tried to flee the situation multiple times despite the dead guy actively provoking him, and the death was ultimately accidental and only happened in the course of the Suspect attempting to flee - in short, self-defense/accidental manslaughter/justifiable homicide. However, for the few hours between the cops originally arriving at the scene and this footage being dug up, how would the Suspect be treated, i.e. when he's at the hospital, would he have to be restrained/handcuffed to the bed, even if just as a technicality/formality? How long would it take for this to officially be declared a justifiable homicide, and who would do it since the Sheriff is not allowed to touch this case in his capacity as a police officer? I'm hoping to have the Suspect free to go home and in the clear by the next day, after the sedation has worn off, but if that's a no-go, would he have to be in jail or any amount of time?