...

Police to Check Bags on NYC Subways.

Officials declined to specify how frequently the checks would occur. The inspections are scheduled to be in place by rush hour on Friday. Authorities said bus and commuter train passengers will also be checked.

[snip]
[Police Commissioner Raymond] Kelly said passengers selected for searches will be approached by officers, who will ask them what they are carrying, and request them to open their bags. If an officer looking for explosives finds some other form of contraband, police said that person would be subject to arrest.