When a normal investigation, including interviews and statements from employees and other individuals, does not seem to be giving you the information you want, you may consider some alternative information-gathering methods.
Before you do use more advanced methods of investigation, be sure to weigh the practicality of the information you would get against the time and trouble you'll go to get it. And remember - you still may not get the information you want.
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Some of the methods that can be used in certain circumstances are:
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