Louis Scala drove through Staten Island in a Lickety Split ice cream truck as a camouflage for something ilegal. Louis Scala used the ice cream truck to sell oxycodone, a highly addictive prescription painkiller, to waiting addicts, they said.Mr. Scala was one of 31 people indicted in what the authorities described as drug dealers who have sold at nearly 43,000 oxycodone pills, worth $1 million