And this:
Spectre 4 RDD (Radar Detector Detector) Test 2009 that indicates Valentine leaks more from the rear than it does from the front, which is bad, because the preferred mode of use is to run in the far left lane, passing cars at a decent clip, until your Spectre alerts and then you point it at the individual cars that you're approaching in order to nail 'em.
More recent threads indicate that there is no interest in plugging the Valentine leak. Apparently it would require a ground-up redesign.