Entries Tagged "law enforcement"

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Chemical Trace Screening

New advances in technology:

“Mass spectrometry is one of the most sensitive methods for finding drugs, chemicals, pollutants and disease, but the problem is that you have to extract a sample and treat that sample before you can analyze it,” said Evan Williams, a chemistry professor at UC Berkeley.

That process can take anywhere from two to 15 minutes for each sample. Multiply that by the number of people in line at airport security at JFK the day before Thanksgiving, and you’ve got a logistical nightmare on your hands.

The research from Purdue, led by analytical chemistry professor Graham Cooks, developed a technique called desorption electrospray ionization, or DESI, that eliminates a part of the mass spectrometry process, and thus speeds up the detection of substances to less than 10 seconds, said Williams.

To use it, law enforcement officials and security screeners will spray methanol or a water and salt mixture on the surface of an object, or a person’s clothing or skin, and test immediately for microscopic traces of chemical compounds.

As this kind of technology gets better, the problems of false alarms becomes greater. We already know that a large percentage of U.S. currency bears traces of cocaine, but can a low-budget terrorist close down an airport by spraying trace chemicals randomly at passengers’ luggage when they’re not looking?

Posted on October 14, 2005 at 1:56 PM • View Comments

Terrorism Laws Used to Stifle Political Speech

Walter Wolfgang, an 82-year-old political veteran, was forcefully removed from the UK Labour party conference for calling a speaker, Jack Straw, a liar. (Opinions on whether Jack Straw is or is not a liar are irrelevant here.) He was later denied access to the conference on basis of anti-terror laws. Keep in mind that as recently as the 1980s, Labour Party conferences were heated affairs compared with today’s media shows.

From The London Times:

A police spokeswoman said that Mr Wolfgang had not been arrested but detained because his security accreditation had been cancelled by Labour officials when he was ejected. She said: “The delegate asked the police officer what powers he was using. The police officer responded that he was using his powers under Section 44 of the Terrorism Act to confirm the delegate’s details.”

Also this:

More than 600 people were detained under the Terrorism Act during the Labour party conference, it was reported yesterday.

Anti-Iraq war protesters, anti-Blairite OAPs and conference delegates were all detained by police under legislation that was designed to combat violent fanatics and bombers – even though none of them was suspected of terrorist links. None of those detained under Section 44 stop-and-search rules in the 2000 Terrorism Act was arrested and no-one was charged under the terrorism laws.

Walter Wolfgang, an 82-year-old Jewish refugee from Nazi Germany, was thrown out of the conference hall by Labour heavies after heckling the Foreign Secretary, Jack Straw.

When he tried to get back in, he was detained under Section 44 and questioned by police. The party later apologised.

But the Home Office has refused to apologise for heavy-handed tactics used at this year’s conference.

A spokesman insisted: “Stop and search under Section 44 is an important tool in the on-going fight against terrorism.

“The powers help to deter terrorist activity by creating a hostile environment for terrorists.”

He added that the justification for authorising the use of the powers was “intelligence-led and based on an assessment of the threat against the UK.”

The shadow home secretary, David Davis, said: “Laws that are designed to fight terrorism should only be used against terrorism.”

Posted on October 10, 2005 at 8:13 AM • View Comments

Automatic License Plate Scanners

The Boston Transportation Department, among other duties, hands out parking tickets. If a car has too many unpaid parking tickets, the BTD will lock a Denver Boot to one of the wheels, making the car unmovable. Once the tickets are paid up, the BTD removes th boot.

The white SUV in this photo is owned by the Boston Transportation Department. Its job is to locate cars that need to be booted. The two video cameras on top of the vehicle are hooked up to a laptop computer running license plate scanning software. The vehicle drives around the city scanning plates and comparing them with the database of unpaid parking tickets. When a match is found, the BTD officers jump out and boot the offending car. You can sort of see the boot on the front right wheel of the car behind the SUV in the photo.

This is the kind of thing I call “wholesale surveillance,” and I’ve written about license plate scanners in that regard last year.

Technology is fundamentally changing the nature of surveillance. Years ago, surveillance meant trench-coated detectives following people down streets. It was laborious and expensive, and was only used when there was reasonable suspicion of a crime. Modern surveillance is the policeman with a license-plate scanner, or even a remote license-plate scanner mounted on a traffic light and a policeman sitting at a computer in the station. It’s the same, but it’s completely different. It’s wholesale surveillance.

And it disrupts the balance between the powers of the police and the rights of the people.

[…]

Like the license-plate scanners, the electronic footprints we leave everywhere can be automatically correlated with databases. The data can be stored forever, allowing police to conduct surveillance backwards in time.

The effects of wholesale surveillance on privacy and civil liberties is profound; but unfortunately, the debate often gets mischaracterized as a question about how much privacy we need to give up in order to be secure. This is wrong. It’s obvious that we are all safer when the police can use all techniques at their disposal. What we need are corresponding mechanisms to prevent abuse, and that don’t place an unreasonable burden on the innocent.

Throughout our nation’s history, we have maintained a balance between the necessary interests of police and the civil rights of the people. The license plate itself is such a balance. Imagine the debate from the early 1900s: The police proposed affixing a plaque to every car with the car owner’s name, so they could better track cars used in crimes. Civil libertarians objected because that would reduce the privacy of every car owner. So a compromise was reached: a random string of letter and numbers that the police could use to determine the car owner. By deliberately designing a more cumbersome system, the needs of law enforcement and the public’s right to privacy were balanced.

The search warrant process, as prescribed in the Fourth Amendment, is another balancing method. So is the minimization requirement for telephone eavesdropping: the police must stop listening to a phone line if the suspect under investigation is not talking.

For license-plate scanners, one obvious protection is to require the police to erase data collected on innocent car owners immediately, and not save it. The police have no legitimate need to collect data on everyone’s driving habits. Another is to allow car owners access to the information about them used in these automated searches, and to allow them to challenge inaccuracies.

The Boston Globe has written about this program.

Richard M. Smith, who took this photo, made a public request to the BTD last summer for the database of scanned license plate numbers that is being collected by this vehicle. The BTD told him at the time that the database is not a public record, because the database is owned by AutoVu, the Canadian company that makes the license plate scanner software used in the vehicle. This software is being “loaned” to the City of Boston as part of a “beta” test program.

Anyone doubt that AutoVu is going to sell this data to a company like ChoicePoint?

Posted on October 7, 2005 at 1:49 PM • View Comments

Surveillance Via Cell Phones

It captures criminals:

Today, even murderers carry cell phones.

They may have left no witnesses, fingerprints or DNA. But if a murderer makes calls on a cell phone around the time of the crime (and they often do), they leave behind a trail of records that show not only who they called and at what time, but where they were when the call was made.

The cell phone records, which document what tower a caller was nearest when he dialed, can put a suspect at the scene of the crime with as much accuracy as an eyewitness. In urban areas crowded with cell towers, the records can pinpoint someone’s location within a few blocks.

Should a suspect tell detectives he was in another part of town the night of the murder, records from cell phone towers can smash his alibi, giving detectives leverage in an interview.

I am fine with the police using this tool, as long as the warrant process is there to ensure that they don’t abuse the tool.

Posted on September 29, 2005 at 11:36 AM • View Comments

The Beginnings of a U.S. Government DNA Database

From the Washington Post:

Suspects arrested or detained by federal authorities could be forced to provide samples of their DNA that would be recorded in a central database under a provision of a Senate bill to expand government collection of personal data.

The controversial measure was approved by the Senate Judiciary Committee last week and is supported by the White House, but has not gone to the floor for a vote. It goes beyond current law, which allows federal authorities to collect and record samples of DNA only from those convicted of crimes. The data are stored in an FBI-maintained national registry that law enforcement officials use to aid investigations, by comparing DNA from criminals with evidence found at crime scenes.

[…]

The provision, co-sponsored by Kyl and Sen. John Cornyn (R-Tex.), does not require the government to automatically remove the DNA data of people who are never convicted. Instead, those arrested or detained would have to petition to have their information removed from the database after their cases were resolved.

Posted on September 27, 2005 at 11:31 AM • View Comments

Actors Playing New York City Policemen

Did you know you could be arrested for carrying a police uniform in New York City?

With security tighter in the Big Apple since Sept. 11, 2001, the union that represents TV and film actors has begun advising its New York-area members to stop buying police costumes or carrying them to gigs, even if their performances require them.

The Screen Actors Guild said in a statement posted on its Web site on Friday that “an apparent shift in city policy” may put actors at risk of arrest if they are stopped while carrying anything that looks too much like a real police uniform.

The odds that an actor might be stopped and questioned on his or her way to work went up this month when police began conducting random searches of passengers’ bags in New York’s subway system. The guild said two of its members had been detained by security personnel at an airport and a courthouse in recent months for possessing police costumes.

This seems like overkill to me. I understand that a police uniform is an authentication device—not a very good one, but one nonetheless—and we want to make it harder for the bad guys to get one. But there’s no reason to prohibit screen or stage actors from having police uniforms if it’s part of their job. This seems similar to the laws surrounding lockpicks: you can be arrested for carrying them without a good reason, but locksmiths are allowed to own the tools of their trade.

Here’s another bit from the article:

Under police department rules, real officers must be on hand any time an actor dons a police costume during a TV or film production.

I guess that’s to prevent the actor from actually impersonating a policeman. But how often does that actually happen? Is this a good use of police manpower?

Does anyone know how other cities and countries handle this?

Posted on August 25, 2005 at 12:52 PM • View Comments

The Kutztown 13

Thirteen Pennsylvania high-school kids—Kutztown 13—are being charged with felonies:

They’re being called the Kutztown 13—a group of high schoolers charged with felonies for bypassing security with school-issued laptops, downloading forbidden internet goodies and using monitoring software to spy on district administrators.

The students, their families and outraged supporters say authorities are overreacting, punishing the kids not for any heinous behavior—no malicious acts are alleged—but rather because they outsmarted the district’s technology workers….

The trouble began last fall after the district issued some 600 Apple iBook laptops to every student at the high school about 50 miles northwest of Philadelphia. The computers were loaded with a filtering program that limited Internet access. They also had software that let administrators see what students were viewing on their screens.

But those barriers proved easily surmountable: The administrative password that allowed students to reconfigure computers and obtain unrestricted Internet access was easy to obtain. A shortened version of the school’s street address, the password was taped to the backs of the computers.

The password got passed around and students began downloading such forbidden programs as the popular iChat instant-messaging tool.

At least one student viewed pornography. Some students also turned off the remote monitoring function and turned the tables on their elders_ using it to view administrators’ own computer screens.

There’s more to the story, though. Here’s some good commentary on the issue:

What the parents don’t mention—but the school did in a press release—is that it wasn’t as if the school came down with the Hammer of God out of nowhere.

These kids were caught and punished for doing this stuff, and their parents informed.

Over and over.

Quoth the release:

“Unfortunately, after repeated warnings and disciplinary actions, a few students continued to misuse the school-issued laptops to varying degrees. The disciplinary actions included detentions, in-school suspensions, loss of Internet access, and loss of computer privileges. After each disciplinary action, parents received either written notification or telephone calls.”

What was the parents’ reaction those disciplinary actions? Some of them complained that—despite signing a document agreeing to the acceptable use policy—the kids should be able to do whatever they wanted to with the free machines.

“We signed it, but we didn’t mean it”?

Yes, the kids should be punished. No, a felony comviction is not the way to punish them.

The problem is that the punishment doesn’t fit the crime. Breaking the rules is what kids do. Society needs to deal with that, yes, but it needs to deal with that in a way that doesn’t ruin lives. Deterrence is critical if we are to ever have a lawful society on the internet, but deterrence has to come from rational prosecution. This simply isn’t rational.

EDITED TO ADD (2 Sep): It seems that charges have been dropped.

Posted on August 22, 2005 at 6:56 AM • View Comments

Cryptographically-Secured Murder Confession

From the Associated Press:

Joseph Duncan III is a computer expert who bragged online, days before authorities believe he killed three people in Idaho, about a tell-all journal that would not be accessed for decades, authorities say.

Duncan, 42, a convicted sex offender, figured technology would catch up in 30 years, “and then the world will know who I really was, and what I really did, and what I really thought,” he wrote May 13.

Police seized Duncan’s computer equipment from his Fargo apartment last August, when they were looking for evidence in a Detroit Lakes, Minn., child molestation case.

At least one compact disc and a part of his hard drive were encrypted well enough that one of the region’s top computer forensic specialists could not access it, The Forum reported Monday.

This is the kind of story that the government likes to use to illustrate the dangers of encryption. How can we allow people to use strong encryption, they ask, if it means not being able to convict monsters like Duncan?

But how is this different than Duncan speaking the confession when no one was able to hear? Or writing it down and hiding it where no one could ever find it? Or not saying anything at all? If the police can’t convict him without this confession—which we only have his word for as existing—then maybe he’s innocent?

Technologies have good and bad uses. Encryption, telephones, cars: they’re all used by both honest citizens and by criminals. For almost all technologies, the good far outweighs the bad. Banning a technology because the bad guys use it, denying everyone else the beneficial uses of that technology, is almost always a bad security trade-off.

EDITED TO ADD: Looking at the details of the encryption, it’s certainly possible that the authorities will break the diary. It probably depends on how random a key Duncan chose, although possibly on whether or not there’s an implementation error in the cryptographic software. If I had more details, I could speculate further.

Posted on August 15, 2005 at 2:17 PM • View Comments

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Sidebar photo of Bruce Schneier by Joe MacInnis.