There is one hard and fast rule that you should always follow when it comes to identifying fraudulent investment schemes: if it sounds too good to be true then it most likely is.
While there are some investment opportunities that have the potential to yield massive returns, there will always be a proportionate degree of risk. Anyone promising large returns with minimal risk is almost certainly hiding something. The best way to safeguard against investment fraud is to do secondary research. Ask around, search online and always take your time before making a decision.