Could you be more specific? I assume that you are referring to the theft of material possessions.
As far as "harming no one", that's an excellent creed to live by. But because not everyone lives by this creed, there will be times when you have to defend yourself.
I don't know how many times I've passed this link on now, but it seems to fit the situations that I've been reading here...
At my website, The Witch's Corner, on the spells & potions page, you will find a link to a hoodoo site called "Lucky Mojo" and there you will find free spells. I'm sure that among this choice of spells you will find what you need to stop a thief...
http://ladyamythyst.webs.com/spellspotions.htm
Good luck to you.
