Supposedly the NASD has a whole department whose job it is to trace "unusual volume". Guess they fell down on the job in this case. There should be automated triggers that would result in a real person looking into the situation.
But of course penny stocks aren't like real stocks. There can be unusual volume for a great many different reasons. A pump from a couple of tout sheets can do the trick. So it could be difficult to pinpoint the problem quickly.
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