Criminal cases often turn on issues of fact. The police can slip into the habit of using a "knowledge filter" when investigating a case.
That is, they formulate a theory and then screen their evidence through it. This can mean that they don't look for or find evidence that is contrary to their premise. If their theory is that you committed the crime, that means trouble. Finding evidence and witnesses favorable to the accused becomes the job of the defense.
A good Private Investigator is an essential asset to any defense team. At Mausert & Amedio, we draw upon the skills several experienced Investigators that work for our clients on a freelance basis. In past cases, the use of a Private Investigator has meant the difference between having to go to trial and persuading the District Attorney to dismiss or substantially reduce felony charges.
Beware of attorneys who attempt to do the work of a Private Investigator themselves. An attorney should avoid being put into the position of being a material witness for his or her client. If the lawyer becomes a necessary witness, that person can no longer represent you. It can be disconcerting to have have to change attorneys in the middle of a case. That alone is a good reason to work with a law firm that uses competent Private Investigators when needed.