As someone who has tried a fair share of criminal cases in Indiana I have just a bit of info that might be interesting to you guys:
Dom. Abuse cases are impossible to pursue if the gf refuses to testify and prosecutors rarely push on because they don't want to lose (ok that's not specific to IN)
Pre-trial diversion is available to anyone upon arrest for their first misdemeanor. They have to pay a fine in the form of "program costs" and perform community service and they receive no criminal penalties. PTD is supposed to be for guilty people, like a "warning." This is so because participation in the program precludes you from entering it again at a latter date. Sometimes however, people just go into it as a way to avoid paying a lawyer and fighting the charges in court. Either way, it warrants notice that he chose NOT to fight the case, but instead, use up his one warning.