Mick Philpott has admitted hitting a previous girlfriend, but says she deserved it because he claims she hit his children.
Prosecutor Richard Latham claimed Philpott hit his mistress, Lisa Willis, with a stick.
Philpott says he "can't recollect" whether he did or not.
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The decision represents something of a victory for the president who will now be able to enforce most of his controversial 90-day ban.
Cool in the north, warmer air to the south
Police have warned the drug, known locally as "pink champagne", could be deadly.