Many cases of accidents - especially if there are victims that have been hurt or died are unresolved due to either lack of evidences, witnesses or identification of suspect. This may entail the need for longer process of investigation or dismissal especially if the people responsible is unidentifiable.
However, should there be any means to be able to give justice for the victims and their families, it should be sought. Means to do this could be through gathering of evidences, tracing and background investigation. No matter how big or small a lead of evidence can be, it may help to solve the case altogether. Nowadays, installed CCTV cameras is a great tool to review how the accident happened or should it capture the identities of the person involved, it can be a great evidence. In cases of road accidents, getting or capturing the plate number of vehicle can trace the driver's identity. You can check their profile or their residence, work, and other information that can lead to finding them should they be hiding. This can so be done in cases that witnesses hide because of fear to testify due to treats that could endanger them.
History of misdemeanors or committed crimes can also be checked via background check and if there are addiction or psychological problem history, should it help as an evidence. You can have access to these information not just by hiring private investigators. You may also do investigate through online people finder. Doing all these - there would be possibilities to finally getting the justice that must be served.