I had a similar experience on a grand jury in new york (where you decide whether or not a felony case should go to trial at all) and was shocked to see a prosecutor come back 4 times on the same case, each time with a slightly less serious charge (ie, starting with level 1 felony assault and ending with some lesser assualt charge). So even after we the grand jury decided there was not enough evidence for the felony assault case to go to trial, they attempt it over and over again, with the same evidence, though requesting a slightly lesser charge, desperate for a different result.