Once you have obtained the cowl of the grey fox, you can commit any crime and get away with it. All you have to do is, just before you steal,kil etc. equip the grey fox cowl, then when you have finished,remove the cowl again and fines and infamy will be put against the grey fox, allowing you to keep a clean record.as long as you can get the cowl off in time you can use it with guards around, they just run straight past you.