Your past can haunt you. Especially if you have a previous false accusation that you were acquitted of or was dismissed and the statute of limitations have run or if you just did something stupid and you were given a second chance. It can loom around forever if you do not make the effort to get an expunction order or order on a petition for non-disclosure.
If you have a prior theft arrest that you were not convicted of, then it is important to get your record taken care of because no employer wants to hire someone who might steal from him.
If you have a prior arrest on your record on your assault, you need to try to get that expunged or sealed if you were not convicted or it probably will give you problems as employment possibilities arise in the future.