If a prosecutor or judge could force a mistrial any time a case wasn't going his way, and get a free do-over, double jeopardy would be pretty meaningless. If defense misconduct or unforeseen circumstances (including a hung jury) cause a mistrial, that's one thing. If, however, a mistrial is a result of prosecutorial or judicial misconduct, however, I don't see any legitimate basis for retrial.
Greta just went off on the east coast and BORe came on with Geraldo. Before I grabbed the remote I hear Geraldo rambling about how the prosecution overcharged...blah, blah. I cannot believe my ears.