Our criminal lawyers in Sydney look to exonerate their clients by finding evidence of their innocence. Suppose a DNA sample, video footage, or any other piece of physical evidence was not preserved after its discovery, it might not be possible for an attorney to prove that his client didn’t commit a crime. Remember, though: if you find some relevant evidence, don’t handle it yourself. Bring it to the attention of your lawyer and he/she will advise you on how to preserve it.