Originally Posted by cmwinters
Hm. At first thought, I'd say go with "it would depend on the caster", but on the other hand, assuming the Ministry *doesn't* consider Legilimency a Dark Art (which I think is a very bad assumption) and that they would employ such a practice, I think you could go for it being automatically Occluded, which would make detection even more difficult.
The thing about Occlumency is, I think that in order to be effective at it (the way Snape was against the Dark Lord), you can't just have a great big gap, or a great big black spot where something should obviously be, because that would indicate that you're hiding something. You'd have to either have fuzzy edges around something (meaning you forgot or just didn't bother to remember, like your drive home from three weeks ago), or something in its place to make it convincing.