My question involves labor and employment law for the state of: Illinois

I recently applied for the local police department and was disqualified because of an arrest that was thrown out in court. The police implied that I was not being cooperative and they considered my posture as threatening. I was thrown to the ground, handcuffed and fingerprinted. I am a college graduate with an otherwise exemplary work and personal history. Can this be held against me and if not how do I refute the disqualification?