IIRC there were reported problems with NASA's testing of the (so-called) EmDrive in the past, so I'd very much doubt this is anything but a measurement error. There's always the chance that they stumbled on something, but I doubt it.
Well, I guess if they ever get something like the EmDrive to work in the first place we might as well throw out the laws of physics altogether, including relativity. That doesn't seem too likely, though...
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