Could our legal system as it is currently handle time travel? I stop a mass shooting before it happens, have tons of news stories and clippings of this event that no longer exists, can anything be done to prosecute the shooter? Or what if I kill the shooter before it happens, will those new stories and clippings help my case any?
You'd create a whole new universe wouldn't you if you kill the shooter before the event? Things back home would change wouldn't they?
I was thinking more along the lines of going backwards in time seeing the crime, documenting it, then returning to the present without having altered anything to present your findings. But mainly for cases that have largely been unsolved.