The 4th amendment to the constitution states:
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
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NEW YORK -- Police will begin conducting random searches of packages and backpacks carried by people entering city subways, Mayor Michael Bloomberg announced Thursday after a new series of bomb attacks in London.
Authorities said the system for the checks is still being developed, but the plan is for passengers carrying bags to be selected at random before they have passed through turnstiles.
Police Commissioner Raymond Kelly promised that officers would not engage in racial profiling, and that passengers will be free to "turn around and leave" rather than consent to a search.
Officials wouldn't immediately say how frequently the checks would occur. The checks are scheduled to be in place by rush hour on Friday morning.
"We just live in a world where, sadly, these kinds of security measures are necessary," Bloomberg said. "Are they intrusive? Yes, a little bit. But we are trying to find that right balance."
Authorities said there is also a possibility that checks will be conducted of some bus and train passengers.
http://www.wnbc.com/news/4753242/detail.html
I am just wondering...is this constitutional? How?