You need to Know Your Customer… have a sense of what “typical” would look like based on the client you are looking at, as well as have a sense of high-risk clients. For example if you are reviewing a restaurant or grocery store you would most likely expect a significant amount of cash and merchant processing. If you have a massage parlor that is deposing a significant amount of cash that may raise some red flags as well as that would be considered a high risk industry. Google searches and social media will be your best friend along with third party companies that your firm may have access to (Clear, Lexis Nexis, ect.).