You shoot any LEO especially Federal by mistake tragic accident or anything else and you are toast regardless of Castle law or anything else no excuses accepted by LE. Even if you can afford the best legal defence team $ can buy your chances of going to prison are still 50/50 in this type situation. The only time this type of shooting is looked at objectively is when a LEO shoots an innocent citizen. Then there are always extenuating circumstances that need to be looked at. Go figure..