Short answer: yes. The police can decide whether to proceed criminally once they are involved, pretty much no matter what the folks involved wish. That said, if no witnesses show up or provide evidence, it is usually impossible to actually convict a defendant. This is not really a family law inquiry; you should probably consult criminal defense counsel for what, if anything, either you or your sister should do at this point.
Answered on Feb 03rd, 2018 at 1:58 PM