Logistic regression was used to assess five different police actions that an investigating police officer can choose to employ when handling a domestic violence call. Each significantly increases the likelihood the prosecutor will file charges: obtain photographs (60 percent); find and arrest the defendant (94 percent); obtain an emergency protective order (87 percent); locate additional witnesses (68 percent); and list more than one criminal charge in the police report (284 percent). Three optional police actions increase the likelihood of criminal conviction: find and arrest the defendant (78 percent); obtain an emergency protective order (102 percent); list more than one charge (142 percent). Survival analysis shows a sixth action, completing the investigation the same day, to significantly increase rates of criminal case filing and also rates of criminal conviction. A strong case, best practices model for the investigation of domestic violence incidents was validated and is presented. Police discretion is discussed. Lawmakers should consider making these optional investigative actions mandatory.