In the filter there's no mouse-over or link or anything to explain what the different evidence codes acronyms stand for.
Implementing the hover in this case on this page is probably not something that we'll get to (for various reasons that I can go in to); although I'm a little surprised that there isn't a "question mark help" next to the evidence codes.
However, as we build up the new search interface, we'll be able to add something analogous that should help make that clear.
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