Well, I think that there is a class or function called STIAboveThreshold  somewhere, which is probably not used anywhere any more ... so that should get removed too.

oh, wait .. I just found filter_InAttentionalFocus but that does not seem to be used anywhere, either ... and there's LTIAboveThreshold
...
damn, looks like there are unit tests that use these, but whatever its testing is probably pointless, so should be removed. Or maybe we should move the code to the tests directory.. Hmmm.  Cleanup is sometimes painful.