Just two days into an experimental program that would place undercover air marshals in train, bus, ferry and other mass transit stations, the Transportation Security Administration yesterday said its test has been scaled back, owing to confusion over the rollout. TSA officials had planned to deploy teams of air marshals, local law enforcement officers and bomb-sniffing dogs at seven locations around the nation this week to test whether the agency could deter criminals in public transportation stations and conduct surveillance of suspicious activity. Full Story