Again, in relation to limiting what's investigated, once a person is designated and involved in a number of serious operations, wouldn't they very often not be aware of when that person would have to break a law? He wouldn't necessarily be aware of what criminal acitivity was going on and how he would do it, so he couldn't get this type of pre-authorization or limitation that you're talking about.
On June 6th, 2006. See this statement in context.