This is becoming really interesting. According to the news, a researcher who’s really into debunking these kind of claims took a shot at the EM Drive recently. Like all the previous tests, the equipment claimed the drive produced thrust, and the researcher was unable to identify any error.
At this point, this is the fourth different team to experiment with the drive, and they’ve all had the same result. Either we’ve stumbled onto a new propulsion system, or a wonderfully new way to screw up the various sensors used. Obviously, the first possibility would be ground-breaking; but the second is still very interesting.
For those who want to dig through the paper itself, it’s here.