A few weeks ago Billy Mitchell's high scores were disqualified from Donkey Kong Forum. Now he's been expunged entirely from Twin Galaxies. The King Of Kong needs a sequel.
Twin Galaxies stopped short of concluding that MAME had produced the scores but still said “we know for certain that an unmodified original [Donkey Kong] arcade [printed circuit board] did not output the display seen in the videotaped score performances.
“From a Twin Galaxies viewpoint, the only important thing to know is whether or not the score performances are from an unmodified original DK arcade PCB as per the competitive rules,” the organization said. “We now believe that they are not from an original unmodified DK arcade PCB, and so our investigation of the tape content ends with that conclusion and assertion.”
Here's the original DK Forum post with the evidence that he cheated.