Entries Tagged "false positives"

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Sneaking Items Aboard Aircraft

A Pennsylvania Supreme Court Justice faces a fine—although no criminal charges at the moment—for trying to sneak a knife aboard an aircraft.

Saylor, 58, and his wife entered a security checkpoint Feb. 4 on a trip to Philadelphia when screeners found a small Swiss Army-style knife attached to his key chain.

A police report said he was told the item could not be carried onto a plane and that he needed to place the knife into checked luggage or make other arrangements.

When Saylor returned a short time later to be screened a second time, an X-ray machine detected a knife inside his carry-on luggage, police said.

There are two points worth making here. One: ridiculous rules have a way of turning people into criminals. And two: this is an example of a security failure, not a security success.

Security systems fail in one of two ways. They can fail to stop the bad guy, and they can mistakenly stop the good guy. The TSA likes to measure its success by looking at the forbidden items they have prevented from being carried onto aircraft, but that’s wrong. Every time the TSA takes a pocketknife from an innocent person, that’s a security failure. It’s a false alarm. The system has prevented access where no prevention was required. This, coupled with the widespread belief that the bad guys will find a way around the system, demonstrates what a colossal waste of money it is.

Posted on February 28, 2005 at 8:00 AM • View Comments

Security Risks of Frequent-Shopper Cards

This is from Richard M. Smith:

Tukwila, Washington firefighter, Philip Scott Lyons found out the hard way that supermarket loyalty cards come with a huge price. Lyons was arrested last August and charged with attempted arson. Police alleged at the time that Lyons tried to set fire to his own house while his wife and children were inside. According to the KOMO-TV and the Seattle Times, a major piece of evidence used against Lyons in his arrest was the record of his supermarket purchases that he made with his Safeway Club Card. Police investigators had discovered that his Club Card was used to buy fire starters of the same type used in the arson attempt.

For Lyons, the story did have a happy ending. All charges were dropped against him in January 2005 because another person stepped forward saying he set the fire and not Lyons. Lyons is now back at work after more than 5 months of being on administrative leave from his firefighter job.

The moral of this story is that even the most innocent database can be used against a person in a criminal investigation turning their lives completely upside down.

Safeway needs to be more up-front with customers about the potential downsides of shopper cards. They should also provide the details of their role in the arrest or Mr. Lyons and other criminal cases in which the company provided Club Card purchase information to police investigators.

Here is how Safeway currently describes their Club Card program in the Club Card application:

We respect your privacy. Safeway does not sell or lease personally identifying information (i.e., your name, address, telephone number, and bank and credit card account numbers) to non-affiliated companies or entities. We do record information regarding the purchases made with your Safeway Club Card to help us provide you with special offers and other information. Safeway also may use this information to provide you with personally tailored coupons, offers or other information that may be provided to Safeway by other companies. If you do not wish to receive personally tailored coupons, offers or other information, please check the box below. Must be at least 18 years of age.

Links:

Firefighter Arrested For Attempted Arson

Fireman attempted to set fire to house, charges say

Tukwila Firefighter Cleared Of Arson Charges

Posted on February 18, 2005 at 8:00 AM • View Comments

Airplane Defense Security Trade-Off

It’s nice to see the government actually making security trade-offs. From the Associated Press:

Outfitting every U.S. commercial passenger plane with anti-missile systems would be a costly and impractical defense against terrorists armed with shoulder-fired rockets, according to a study released Tuesday.

Researchers said it could cost nearly $40 billion over 20 years to deploy defense technology on the country’s 6,800 passengers jets. By comparison, the federal government currently spends roughly $4.4 billion a year on all transportation security.

The Rand study also cited the unreliability of the system, and the problems of false alarms.

Identifying terrorism security countermeasures that aren’t worth it…maybe it’s the start of a trend.

Posted on January 26, 2005 at 8:42 AM • View Comments

Terrorism False Positives

Security systems fail in two different ways. The first is the obvious one: they fail to detect, stop, catch, or whatever, the bad guys. The second is more common, and often more important: they wrongly detect, stop, catch, or whatever, an innocent person. This story is from the New Zealand Herald:

A New Zealand resident who sent $5000 to his ill uncle in India had the money frozen for nearly a month because his name matched that of several men on a terrorist watch list.

Because there are far more innocent people than guilty ones, this second type of error is far more common than the first type. Security is always a trade-off, and when you’re trading off positives and negatives, you have to look at these sorts of things.

Posted on January 8, 2005 at 8:00 AM • View Comments

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Sidebar photo of Bruce Schneier by Joe MacInnis.