good old-fashioned horse manure. reporter: senator claire mccaskill is launching an investigation into those ads asking people to help by flagging potential scams. sensa is one of four diet supplementmakers the ftc has charged with deceptive advertising saying there s no proof those products work. other targets, hcg diet direct, distributorses of hormone drugs. place them under your tongue, the company says, and you ll lose weight fast. lean spa, the company shut down by using fake websites to market fake cloenzing and diet products. for almond scented skin creams which the company says could hone an inch of fat in a month. people want to lose weight and they don t want to work at it. reporter: they pay $34 million in settlements, the money returning to customers. they worried about who these companies are targeting. a teenage clients recently