users with a high warn level (around 70-80%, i don't really know) lose the right to see the warn logs.
if they want to see the reason for their last warn or when they can ask for a removal they have to ask to a moderator.
they don't have access to PMs as well so they have to make a tread to ask for this kind of information.
this is both time consuming for moderators and annoying for other users so why don't you just let them to see the warn log regardless of the warn level?