There are two important benefits to utilising the services of an independent professional to obtain evidence and build a case. One is that the independent contractor has nothing to gain or lose in the matter. That is to say, the investigator has no conflict of interest. Therefore there is no reason for him or her to suppress evidence, to unreasonably emphasise or to obfuscate any point of fact, or to add anything. That being the case, there is less basis for a counter-party or judge to criticise your case as having been polluted by a conflict of interest in its construction. The investigator's independent report will prove the integrity of your case.

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The Second reason to engage an external professional, especially one with several years' experience, is that the process of gathering evidence is not as straightforward as it may sound. It requires not only an ability to spot implications and questions arising real-time, as information comes to you. This occurs during forensic interviews, while inspecting incident scenes, while speaking casually under pretext, or with full disclosure.  A "do it once and do it right" principle applies. But less obviously a good investigator is someone widely experienced in life, practical and clear in their thinking, excellent at seeing relevant points among peripheral ones and deeply curious about everything. A person whose comprehension level is so high they can gather much learning from very little input, and who is cynical enough not be swept away by the smooth talk of an appealing witness. They must have excellent communication skills in writing and speech, able to work fruitfully with difficult witnesses and represent faithfully their evidence and explain complex cases succinctly.