Invasion of American Rights and Privacy?

Now that London has been hit twice this month, New York City decided to implement a new search method based on numeric code. The New York Subway system which is used by some 3 million people daily, will be searching subway commuters bags and backpacks before they board. This may sound ok to some, but doesnt that violate our rights as Americans? Is this ok since after all, NY has been hit once, and thier subway system is just like Londons? One thing that strikes me as strange though is this "numeric code" being used, based on an interview with the NYC Police commissioner. He said that approximatly 1 out of every 5-10 people will be searched before boarding the subway. Even though the primary suspects have been/are Arabian males everyone is subject to a friendly search by the NYPD. It's ashame that the USA has come to this, but really, what else can be done? There is a fine line being walked right now, infringing on citizens rights and privacy, or let this go and risk another terrorist attack. Who knows where exactly this is going to lead us? Looks to me as though the Supreme Court is going to be busy for awhile, only time will tell. ~ds~