You can easily use a forensic accountant; just as Government Agencies do

The Financial Markets Authority (FMA), the Serious Fraud Office (SFO), the Police Financial Crime Group (FCG), and the Organised & Financial Crime Agency of NZ (OFCANZ) use forensic accountants to investigate the facts; and to build the structure of their cases.

They know how to go about it; presenting the facts to the lawyers, and to the judge.

The forensic accountant's skill is to sift the facts; identify the core issues & present the facts to ensure your case is robust enough.

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