Actually according to what I can find results have been mixed: one claimed positive at Lockheed, one claimed negative at a national lab, and several non-conclus

Actually according to what I can find results have been mixed: one claimed positive at Lockheed, one claimed negative at a national lab, and several non-conclusive results. As others have stated it's incredibly challenging to accurately measure such tiny forces. The only logical thing to do is to attempt to amplify the effect, which Woodward is apparently doing by trying to build more efficient devices.