By discreetly but thoroughly, researching the background and work history of associates, you gain inzicht into who you are doing business with.
When it comes to fraud and non-integrated behaviour, the people factor is crucial. So you want to know who you are hiring and doing business with. Is the CV correct?
Has one ever been involved in non-integrated behaviour before? Do they possibly (unknowingly) have other interests?
By discreetly but thoroughly investigating the background and, for instance, the work history of candidates for certain positions, you gain insight into who you actually have in front of you.
Not only candidates for certain positions but also intended business partners, your client or the company you want to do business with, can be screened in a professional and customer-friendly manner.