So the central conceit of my story is that everyone has various superhuman powers in modern day America, and one of the powers that everyone has is a superhuman healing factor. Anything we'd classify as a scrape or bruise or other minor damage heals within the hour, any really severe tissue damage will be healed within 24 hours if it doesn't kill you before then, and any completely lost body parts will regrow completely within a week.
Now, the various other superpowers humans now have access to obviously wreak lots of havoc and completely change how society operates, but for this question I wanted to focus on how this particular power affects one particular aspect of life:
Does the fact that damage rapidly heals on any human still alive make things harder in any significant way for criminal investigations to go forward? Are there any crimes that can't be investigated or prosecuted without physical evidence that, as an unfortunate side-effect, this power would quickly destroy? Would it demand any drastic changes to how the justice system works to deal with the rapidly-vanishing proof that certain crimes, like assault, even occurred?