I've dealt with e-discovery sets. No one really has answers to what to do when you have a litigation hold on data. Legislation commonly requires "retention of anything related to X case", but how do you know what's relevant and what isn't? When you are a third party the ambiguity increases. So you end up with an everything and kitchen sink data dump. Even with everything the data is commonly useless without context.…
I think its clear that this would be a problem in an industry where the most used tool is a bookshelf of various common interpretations of law. It just doesn't scale.