Blacklisting and Player search.

I'm sure some of you have had that one person that you blacklisted before and you don't have to deal with them sending PM's and that's great, but (in my case) they follow me around most of the time even though they're blacklisted (using Player Search), I think that there should be a option where if you blacklist a person that you shouldn't be able to be looked up by him/her. This should be looked at or at least implement a method where they can't stalk you in-game when they're blacklisted.