A SCAM ALERT tonight... about some business opportunities promising a 'guaranteed return." Investors beware -- because these opportunities are not what they appear to be. There is one sure-fire way to spot these scams. Channel 4's Nikki Kimbleton tells us how. 00-05 18 - 231:40- 1:45ADVERTISING IS ONE WAY FOR BUSINESSES TO ATTRACT CUSTOMERS. AS LONG AS THERE ARE COMPANIES SEEKING TO SELL SOMETHING ADVERTISING OF SOME SORT WILL LIKELY BE PART OF THE EQUATION.SO, WHEN THE COMPANY - MOBILE BILLBOARDS OF AMERICA - STARTED LOOKING FOR INVESTORS IT HAD NO PROBLEM FINDING THEM."They told investors that they were going to secure advertising from major advertisers to put billboard frames up on the side of trucks."TO BE EXACT - INVESTORS WERE TOLD THEIR INITIAL INVESTMENT WOULD BE $25-THOUSAND DOLLARS AND THEY WOULD MAKE 14% ON THEIR INVESTMENT."They took in about $70-million dollars from investors all over the country unfortunately very little of that got back to investors."THE MASTERMIND BEHIND THE SCAM WAS USING THE MONEY FROM NEW INVESTORS TO PAY OLD INVESTORS "The payout get too big and it collapses and that's what happened here."BASED ON HOW INVESTORS WERE RECRUITED, POSTAL INSPECTORS SAY THIS WAS WHAT'S CALLED "AN AFFINITY SCAM." " basically making someone comfortable with you by telling them they that they are part of something you are a part of"IN THIS CASE - CHURCH GROUPS."He would get pastors to invest, which would in turn a whole new level of confidence for the parishioners of the church."THE IMPACT ON THE LIVES OF VICTIMS WAS DEVASTATING."I know several of the victims have gone back to work at 70 or 75 years of age to make the money to provide for their families."