Most of my clients are lawyers. They tend to favor established relationships and word of mouth advertising. From my experience, its difficult to get your foot in the door. Once you are in, you are in until you screw up

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You also don't want to offer forensic services without proper experience to back it up. Not only will you lack investigative skills and procedural knowledge, you will get killed on the stand. Word gets around fast in the forensics community and you won't keep your job for long.