live one

There's green as in greenhorn, meaning inexperienced and gullible. Those with a pitch to sell are going to spot a live one—in this case government with dollars practically falling out of its pockets—coming from miles away.

They've got a live one in the crowd, he's scary, he looks dangerous, demon possessed, he doesn't know who he is, he speaks in strange voices.

"We got a live one here," he said as he speeds up in pursuit of a car.