According to posts on the NASA Space Flight forum, when lasers were fired into the EmDrive resonance chamber, it was found that some of the beams were travelling faster than the speed of light.

If this is true, then it would mean that the EmDrive is producing a warp field or bubble. A forum post says that “this signature (the interference pattern) on the EmDrive looks just like what a warp bubble looks like. And the math behind the warp bubble apparently matches the interference pattern found in the EmDrive.”