Trigger Finger (2012)

Morgan Westin is a teenage wallflower who may or may not be responsible for her stepsisters murder Detective Harold Casey is brought on to the case once suspicion for the crime falls on Joseph a local drug dealer with whom Casey has a longunsettled score When Casey discovers that the killer might be Morgan not Joseph he decides to help her get away with murder so that the right man can end up in jail But is Morgan a coldblooded killer an innocent victim or something in between