There are down sides to any action you might take. If you live in a state that allows civil action, you can still wind up in court even if the criminal authorities clear you. Either way, Mr. Bad Guy, regardless how nefarious, has family and friends. These people will know you, your family and where you live. Chances are you'll have to move, probably out of state. Bottom line? Make yourself familiar with local laws and ensure situational awareness is at the top peg.