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Old Aug 18, 2009 | 10:21 am
  #16  
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Originally Posted by jkhuggins
Actually, "every Nth person" isn't random at all. It may be "arbitrary", but "arbitrary" and "random" aren't the same thing at all. One element of randomness is unpredictability, and picking every Nth person is completely predictable. Not to mention observably predictable ... imagine the chaos in the line, when people who have figured out today's value of N are jockeying for position in the line to make sure they're not selected. ....
CBP has been using every 'nth' for years. There is no problem with what I proposed, and yes, this stupid device should be abandoned forthwith.

Firstly, random patdowns are useless. Either patdown everyone or no one.

Second, the 'n' number can be changed frequently and vary between WTMD queues - it's far easier and cheaper to spend 30 minutes coming up with an understandable and fair randomness policy than spending millions of dollars to buy someone's high school science fair project.
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Old Aug 18, 2009 | 11:28 am
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Originally Posted by bocastephen
CBP has been using every 'nth' for years.
And, on the whole, I don't have a problem with every "Nth". But that procedure is not "random"; it's "arbitrary". We should call it what it really is. (Yes, I've got a big old stick stuck up my backside about this issue. Comes from having studied too much math.)

Originally Posted by bocastephen
The 'n' number can be changed frequently and vary between WTMD queues - it's far easier and cheaper to spend 30 minutes coming up with an understandable and fair randomness policy than spending millions of dollars to buy someone's high school science fair project.
And now, you open the screeners up to charges of bias. A screener just changes the value of "N", and the next person selected just happens to have an ethnicity different from the screener. Did the screener change the value of "N" truly arbitrarily, or did the screener choose "N" because of racial bias? There's no way to know, either way --- either to prove bias, or to absolve an honest screener from charges of bias.
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Old Aug 18, 2009 | 11:42 am
  #18  
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Originally Posted by jkhuggins
And now, you open the screeners up to charges of bias. A screener just changes the value of "N", and the next person selected just happens to have an ethnicity different from the screener. Did the screener change the value of "N" truly arbitrarily, or did the screener choose "N" because of racial bias? There's no way to know, either way --- either to prove bias, or to absolve an honest screener from charges of bias.
That's why investing 30 minutes in drawing up a written policy is sufficient. CBP can change the N value on the hour, or according to some other policy. It's not rocket science...just think it out and write it down.
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Old Aug 18, 2009 | 12:00 pm
  #19  
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Originally Posted by bocastephen
That's why investing 30 minutes in drawing up a written policy is sufficient. CBP can change the N value on the hour, or according to some other policy. It's not rocket science...just think it out and write it down.
No matter how often you change it the fact remains that it's NOT random.
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Old Aug 18, 2009 | 12:20 pm
  #20  
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Originally Posted by jfulcher
No matter how often you change it the fact remains that it's NOT random.
It doesn't need to be random - either arbitrary or random won't skew results when the chance of someone walking undetected through the WTMD with a gun or bomb is so small to be statistically insignificant.
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Old Aug 18, 2009 | 1:31 pm
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Originally Posted by bocastephen
It doesn't need to be random - either arbitrary or random won't skew results when the chance of someone walking undetected through the WTMD with a gun or bomb is so small to be statistically insignificant.
I agree. So, let's just agree to call it "arbitrary", okay?

Excuse me ... I see a windmill over here that I need to attack ...

Last edited by jkhuggins; Aug 18, 2009 at 2:22 pm Reason: typo
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Old Sep 8, 2009 | 5:21 am
  #22  
 
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Any word on when this ridiculous project will end? The lines at YOW are insane thanks to this hokey pokey dance. I'd hate to see the resulting lines at Pearson if it went ahead!
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Old Sep 8, 2009 | 8:58 am
  #23  
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Actually, Customs and Border Protection discontinued random searches several years ago. They found that it detracted from their ability to look for actual threats. There is a GAO report about this.

There is actual data to suggest that random (or arbitrary) searches interfere with screening functions.

But the TSA isn't interested in research or common sense. They don't live in a world of evidence-based practice.
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Old Sep 8, 2009 | 12:16 pm
  #24  
 
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This is CATSA, not the TSA. Marginally less crap to deal with.
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Old Sep 8, 2009 | 11:50 pm
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Originally Posted by guessaaa
Wirelessly posted (BlackBerry9000/4.6.0.162 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/107)

Noticed this at YOW today. Basically you stand in the lineup, they check your BP, then you stand on a mat. The indicator will then flash an arrow pointing left or right. If it points right, you get a regular check. If it goes left, it's your lucky day - full pat-down after the metal detector. Since I have all the luck in the world, I of course was directed left. They also said that they aren't allowed to patdown if you're under 18. Any other airports participating in this or just YOW?
They can be patted down if they are 6 and over with family. If they are under 16 they need an airline agent with them. The system sucks, we end up having to pat down kids. No one wants that and we feel dirty for do it.
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Old Sep 8, 2009 | 11:51 pm
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Originally Posted by phedre
This is CATSA, not the TSA. Marginally less crap to deal with.
Same amount really, just different smell.
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