A lot of money launderers are very evasive and very secretive. Also, if the investment actions do not make sense. It is a clear indication the person in question is doing something else. If two people are trading lots of money, there might be a reason. Maybe they are trying to hide their money, so the person who got the money might be suspected of being involved in something bad. In short, the transaction is inexplicable. Money laundering is also apparent to shell companies. Money launderers use shell companies to hide money. They transfer the money from one shell company to another without employees in question.