Open Question: criminal record check for health career and open investigation?

police "not actively persuing investigation" but "case is still open", sexual assault allegations made 5 months ago, police havn't even contacted me, just my boss who has relayed what they have said. I am looking at getting into a health field. Can an open investigation of this nature interfere with me going on clinical placements, working, etc in Australia? How long is it likely they will keep investigation open? Do they have to let me know when the investigation is closed?