It's possible that if this persons behaviour was conducted in a professional manner they would have let him into the crime scene but thats a very small possibil

It's possible that if this persons behaviour was conducted in a professional manner they would have let him into the crime scene but thats a very small possibility. The Police can call in an Ambulance or Fire rescue on a whim if they need it. Its more likely that they would not take the risk. At a minimum they would have to ID you and search you first. I doubt very highly this case will make it to court. Or see any sort if compensation. "Show me your ID" "Why?" "Show me your ID! You must obey an officer." "I haven't done anything, I need to know he is OK, and I will be on my way" Thats where any possibility of a civil ending to this story ends. He refused to show his ID while trying to enter a crime scene while officers were apprehending a suspect. At that point he becomes a danger to the Officers. Possibly an accomplice to the person in custody. Who knows what the crime was, how many suspects they were looking for etc. On the self defence note, if anyone were to attempt to enter a crime scene and refuse to show ID and manage to get into an altercation with an Officer which lead to your death. There would be no chance that Officer would be on the wrong side of the law.