posted 01-16-2008 08:57 PM            

This was an attorney referral, after the subject was interviewed in a traffic stop after being observed two days in a row while photographing children at a park, adjacent to an elementary school, both before and after school.

After the traffic stop, investigators interviewed the subject at his home a short time later that same day. Investigators at his home discovered a lot of BDSM equipment, restraints, ball-gags, examination tables, whips (the usual stuff), along with a box of hypodermic needles and other drug paraphernalia.

His explanation to me was that he used the needle to vent molds for projects which he was making from silicone rubber (home-made dildos and related devices).

He admitted some recent use of meth and mj.

He was also wiping the contents of his computer hard drive at the time investigators arrived and interviewed him.

This is one of the oddest looking persons I've ever seen, though I couldn't really describe what about him was odd. He looked like a collage of pieces that didn't fit together.

He's not dumb, and builds surgical endoscopy equipment for a living.

CVOS

Chart 1

Chart 2

Chart 3

r

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"Gentlemen, you can't fight in here. This is the war room."
--(Stanley Kubrick/Peter Sellers - Dr. Strangelove, 1964)

posted 01-16-2008 11:19 PM            

What a mess. Some charts are so messy no editing tool will clean'em up. They would make a good screen printing for a t-shirt-- "This is your polygraph on drugs."

posted 01-17-2008 12:30 AM            

I don't remember whether I actually tried to score them.

It looks as if he pushes is feet on the floor at times. But look closely and you'll see that the tracing doesn't return as expected, so he's either holding tension, or perhaps he's sliding in the chair. Now look what happens in the movement channel at the end of the CVOS, after the last RQ (R6) on chart 2, and at the onset of chart 3.

r

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"Gentlemen, you can't fight in here. This is the war room."
--(Stanley Kubrick/Peter Sellers - Dr. Strangelove, 1964)

posted 01-17-2008 08:18 AM            

Bob, you 'round here?
I would be interested in what a person might look for in such countermeasures. Didn't someone here nickname them "Douge" countermeasures? It would be cool to keep this discussion around---if we had the updated forum, we could have an entire section called "countermeasures." It is and always will be a hot topic around these parts.

posted 01-17-2008 09:15 AM            

The lowest tracing is a movement sensor (not a butt pad). I don't have a the pulse O2 sensor, but I saw Limestone's sensor at APA and it looked to be a very high quality component.

For a number of reasons, I prefer the penumatic movement sensor. I've been using the same sensor for a couple of years, without any problems. I know examiners that have had to replace piezzo sensors several times due to breakeage. The one I use is an un-pressurized sensor that works on residual or atmospheric pressure. Just hook it up and it works. The piezzo sensor does not model low frequency data (muscle activity) correctly, but instead tends to fire and reset much more quickly than the actual physical events occur. Pneumatic sensors are ideal for low frequency data - that's why we use them for respiration. The piezzo sensor would never capture the foot pressure as visually as is displayed above. Though it is placed on the chair, the component is sensitive enough to capture nearly any voluntary or behavioral muscle tension.

r

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"Gentlemen, you can't fight in here. This is the war room."
--(Stanley Kubrick/Peter Sellers - Dr. Strangelove, 1964)

posted 01-17-2008 11:21 AM         

I’ve got several questions:
Q1: I assume you using Lafayette’s pneumatic sensors?
Q2: Is the pneumatic sensor just under the seat, or do you have sensors under the forearms/legs and have them merged with the seat ?

I think (at Chart 1- C7) he may be using his abdominals as if trying to ‘slide & lift’ the buttocks slightly and then holding that position until feels the test is over and then relaxes. Trying to ‘slide-Lift’ the buttocks is going to effect both pneumos- but predominately the abdominal. You also have to stablize the shoulders slightly as well. In doing the manuever there may or may not be increased tension in the forearms while stabilizing the shoulders. If the forearms become involved, we’re going to see some unusual blood pressure arousal.

The question is was he using slight forearm tension to start the ‘slide-lift’ before the test even began and are we getting a ‘false’ bp recording because of this tension. Before announcing the beginning of the test, was the BP tracing and pnuematic sensor line stable? Take a look at Exam 2 Cht 6 at Q .N1 sensor line as well.

Yes Stat- I’m around, I’ve been out shopping for a multifunction scanner- so I can post some ugly charts too. Yes Ray, I’m leaning toward a Brother scanner; although I’m hung up on whether or not I 'need' a 8 x14 document glass size for legal size paper.

posted 01-17-2008 12:24 PM            

I'm not using the Lafayette sensor. I've seen the Lafayette sensor from a few years back. They were pressurized, as was Axcitons. Mine is not. The Lafayette sensor was also about 1 inch think or more, and had all kinds of extra gadgets for arms and feet. The one I use is about 8mm thick and fits flat in a computer bag or poly-gear bag. Its sensitive to buttock, feet, leg, abdominal, arm, head chest, back movement. There is little that you can do that doesn't show up. But its also capable of providing a very stable signal without any filtering. Piezzo devices produce an electrical frequency of their own which must be filtered out of the data, and each of the manufacturers has had to "tune" the filtering of those piezzo devices to achieve what they consider to be minimal noise and optimal sensitivity.

I don't know about a slide-lift thing. He was seated in a chair with no arms, his cuffed arm on a table in front of me, looking to the side of the room that way he's not looking directly at me or away from me. I can see facial movmements and all kinds of other things. We had several false starts due to movement. He came across a lot like your average BDSM/tweaker. When I questioned him further after the test, he made no admissions about anything. Obviously, the test went no-where with the attorney. At the time of the test, I was marveling at how odd the whole thing was.

Looking carefully at the onset and end segments of the charts is interesting.

Here is a screenshot of a more typical looking test, which includes both the pneumatic and piezzo sensors.

Bob, the Brother multi-function machines have been great for me. I have one (8440) that's been a workhorse since 2003, and a smaller 7020 from last year. Both are great, and the bundled PaperPort software is even worthwhile.

r

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"Gentlemen, you can't fight in here. This is the war room."
--(Stanley Kubrick/Peter Sellers - Dr. Strangelove, 1964)

posted 01-17-2008 12:37 PM            

This one includes both the pneumatic and piezzo movement sensors.

Subject if female, alcoholic tweaker.

She complained severely of discomfort from the lower pneumo, and you can see that I gave in and loosened the component to the point where it was useless. We learned during the following week that she was experiencing pain from an ectopic pregnancy at the time of the test.

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"Gentlemen, you can't fight in here. This is the war room."
--(Stanley Kubrick/Peter Sellers - Dr. Strangelove, 1964)

posted 01-17-2008 04:59 PM         

I like your ability to see both the pneumatic + piezo movement sensor lines. Where did you acquire the pnuematic that you are using? I’d like to see it- possibly a web page photo?

Unfortunately pneumatics can’t be utilized in the Lafayette 4000 system (maybe in the 5000 when it debuts though). The re-centering feature of the piezo, as you are already aware, is a shortcoming- and I have reason to question the piezo sensitivity to covert movements as well.