Well, it does make us somewhat safer.
Does it? There's been quite a few posts theorizing as to how easily the machines can be defeated. And now, from the real world, I just read this:
Savage [ed. Adam Savage of Mythbusters] was put through the full-body scanner, and while he joked that it made his penis feel small, no one seemed to notice the items he was carrying on his person. The video tells the rest of the story.
I'm guessing that the body scanner didn't pick the 12-inch razor blades up because while it will pick up liquids and metals, it will only do so if it's close to the skin. At least that's my understanding so far.
However, I don't understand why the metal detector didn't pick the blades up. Perhaps when the TSA agents were randomly picking people for the back scatter machines, they were not also requiring them to go through the metal detector? If so, that is definitely a bad idea!
bokonon said:One cannot easily carry as much explosive in a body cavity as one can conceal under a baggy sweatshirt. Even if someone's entire alimentary canal is packed with explosive, unless it's removed before detonation the body it's packed in will mute the destructive power of the explosion.
1) You and mhaze seem to disagree on this point (posts #255, and 258)
I honestly don't know enough about the topic to evaluate what you're both saying -- perhaps after the holiday weekend, mhaze will be back into the everyday grind, and stop having so much fun and will relent and discuss it a little more with you for the benefit of people like me.
2) Then there's these two articles which disagree with your point. Basically they say enough explosive materials can be packed in body cavities to bring a plane down.
LONDON, Sept. 28, 2009
Al Qaeda Bombers Learn from Drug Smugglers
New Technique of Storing Bomb Materials Inside Body Cavity Nearly Kills a Saudi Prince
Al Qaeda has developed a new tactic that allows suicide bombers to breach even the tightest security, as CBS News correspondent Sheila MacVicar reports.
Inside a Saudi palace, the scene was the bloody aftermath of an al Qaeda attack in August aimed at killing
Prince Mohammed Bin Nayef, head of Saudi Arabia's counter terrorism operations.
To get his bomb into this room, Abdullah Asieri, one of Saudi Arabia's most wanted men, avoided detection by two sets of airport security including metal detectors and palace security. He spent 30 hours in the close company of the prince's own secret service agents - all without anyone suspecting a thing.
How did he do it?
Taking a trick from the narcotics trade - which has long smuggled drugs in body cavities - Asieri had a pound of high explosives, plus a detonator inserted in his rectum.
<snip>
The blast left the prince lightly wounded - a failure as an assassination, but as an exercise in defeating security, it was perfect.
<snip>
[bold ed.]On a plane at altitude, the effects of such a bomb could be catastrophic. And there is no current security system that could stop it.
"Absolutely nothing other than to require people to strip naked at the airport," said Yates.
Terrorism threat of explosives smuggled in body cavities
Borderpol (published 06/10/2009)
Most members of the general public are aware that drug traffickers regularly use couriers or 'mules' to smuggle drugs, either swallowed or inserted, across borders. But what was not so obvious until now is that the same method can be employed to smuggle explosives, detonators, liquids and any of the component parts necessary either for a ready-made 'Improvised Explosive Device' (IED) or for assembly of one on an aircraft.
Drug 'mules' regularly carry 0.8 to 1.25 kg of drugs; a determined individual or group could conceivably carry a lot more explosive material, certainly sufficient for an IED.
Sidney Alford, one of the UK's leading explosives engineers, confirms: 'Half a kilo of explosives is more than enough to bring down an aircraft; any more would usually be a waste of effort.'
Conventional search measures such as 'pat-downs' and metal detectors can be used to determine whether someone is carrying illegal objects or substances on their person, but those objects hidden internally are extremely difficult to detect.
Explosives trace detectors that pick up vapours and particles are of little use in this scenario. Only if there is some seepage into the carrier's body systems will this equipment have any chance of success at all.
[bold ed.]Sniffer dogs offer the best hope of detection but are currently not widely used to screen people.
One useful technology that is available and that does work is the full body scan – the use of X-rays to determine whether a person is carrying any substances on or in the body, either by insertion or ingestion.
However, body scanning only comes into play when the officer or security official has already become suspicious that an individual represents a security threat. Suspicious individuals are currently identified using the existing profiling and risk analysis techniques employed by border officials for screening travellers at borders; these include direct questioning, suspicious behaviour, body language, anomalies in travel documentation, unusual travel patterns and so on.
Jan Steven van Wingerden, managing Director of one of the leading scanner manufacturers OD Security, says: 'Our scanner will pick up any ingested or inserted object within the human body, the scan is performed in less than 10 seconds and is completely safe.'
<snip>
In planning this attack, Al Qaeda have clearly understood what security officials have always known: that [bold ed.]there is no equipment currently widely available that will detect explosives carried internally. What the terrorists will also have noted is that, although this attack failed, the method of delivery and detonation worked. A similar attack on an aircraft would be devastating.
What can be done?
Use dogs for people screening. Hannes Siabert, a [bold ed.]dog training expert with South African company Mechem assured us that 'no matter where or how explosives are carried in the body, a trained sniffer dog would definitely be able to pick it up.' Whilst there are cultural issues associated with the use of dogs, these can be dealt with sympathetically.
Re the article's assertion that the body scanners at US airports will detect objects within the human body. We know that currently that isn't the case. Based on my other readings, I suspect that is because how the scanners are currently configured. But, aside from that apparent inaccuracy, the 2009 article may be mostly accurate.
3) From the Straight Dope web site -- weird things people pack into their bodies; probably not safe for work See 2nd paragraph of SD's reply.
bokonon said:I suspect that sniffing dogs would have the same difficulty detecting explosives in a body cavity that backscatter machines have. Do you know of any facts to the contrary?
See article referenced above. Plus there have been many reports that dogs have been trained to detect an oncoming epileptic attack and that some dogs have been trained to detect cancer. If some breeds' noses are sensitive enough to detect these things -- I don't see why it would be a problem for them to detect contraband or explosives packed inside a body cavity.
And this -- dogs have been trained to find cell phones. They have found them inside walls and, while one of the referenced articles didn't say so as clearly as I would have liked, it implied that they have found cell phones in body cavities also:
It turns out that cell phones smell. And their distinct odor can lead a well-trained canine to a device hidden under a mattress, stashed into a wall or tucked into a fan or radio.
[ed. Cell] Phones have been found in light fixtures, Bibles and body cavities. Some inmates have tried unsuccessfully to conceal them in peanut butter jars to fool the dogs.
"They pick up the scent quickly," said Sgt. William Crampton.
bokonon said:bomb-sniffing dogs won't detect knives, Sarin gas, or other weapons.
Dogs do detect sarin gas per this article:
US Customs to use chemicals sniffer dogs at US entry points.
Publication: Airline Industry Information
Date: Monday, June 9 2003
AIRLINE INDUSTRY INFORMATION-(C)1997-2003 M2 COMMUNICATIONS LTD
The US Bureau of Customs and Border Protection has begun placing dogs trained to sniff out deadly chemicals at entry points.
The bureau, which oversees approximately 300 points of entry, is introducing the dogs at airports, seaports and other US entry points. The dogs have been trained to detect various "signature odours" associated with a range of deadly chemicals, including sarin gas, nerve gas and cyanide, that might be hidden in containers or other objects that terrorists try to smuggle past customs.
Dogs trained to detect the substances include Labrador retrievers, German shepherds and Belgian Malinois. Training began about a year ago, prompted by the 11 September 2001 terrorist attacks.
bokonon said:The attack on 4th amendment rights is precisely the same whether it is dogs or machines doing the sniffing.
I have to think about this some more. It honestly doesn't strike me that way for two reasons. It seems to be a more passive approach. I think the dogs don't approach the passenger unless they smell contraband or explosives on him or her, but I may be mistaken. Also, I really like dogs
See this blog post
Finally, I would like to comment on the safety of the TSA officers (TSO) who will be operating these machines, and will be constant 'bystanders' with respect to the radiation exposure. The range of exposure estimates is a function of where an officer stands during their duty, what percentage of that duty is spent in the same location and how often the machine is running. A TSO could be exposed to as much as 86-1408 mrem per year (assuming 8 hours per day, 40 hours a week, 50 weeks per year and between 30-100% duty and 25-100% occupancy, as defined by the Johns Hopkins report), which is between 86%-141% of the safe exposure of 100 mrem. At the high end, if for example a TSO is standing at the entrance of the scanner when it is running at maximum capacity, then that officer could hit their radiation exposure limit in as few as 20 working days (assuming an 8 hour shift). While we may not be very happy with our TSOs at the moment as the face of these policies, we need to keep in mind that they really should be wearing radiation badges in order to know their specific exposure (especially for those officers who may also have to receive radiation exposure for medical reasons).
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