Amit Katwala

And I guess this comes to the second point, which is it's not really possible to actually assess how accurate the polygraph is when it comes to criminal investigations, because you never actually know what really happened. Say someone gets found guilty with the polygraph, then gets found guilty by a jury and gets sent to prison. That doesn't necessarily mean they were guilty.

And I guess this comes to the second point, which is it's not really possible to actually assess how accurate the polygraph is when it comes to criminal investigations, because you never actually know what really happened. Say someone gets found guilty with the polygraph, then gets found guilty by a jury and gets sent to prison. That doesn't necessarily mean they were guilty.

And I guess this comes to the second point, which is it's not really possible to actually assess how accurate the polygraph is when it comes to criminal investigations, because you never actually know what really happened. Say someone gets found guilty with the polygraph, then gets found guilty by a jury and gets sent to prison. That doesn't necessarily mean they were guilty.

So you can never really know. All you can really tell is that in this case, the polygraph agreed with the jury. In this case, the polygraph didn't agree with the jury. But juries are fallible as well. So you can never really tell how accurate the polygraph actually is in the real world rather than lab studies.

So you can never really know. All you can really tell is that in this case, the polygraph agreed with the jury. In this case, the polygraph didn't agree with the jury. But juries are fallible as well. So you can never really tell how accurate the polygraph actually is in the real world rather than lab studies.

So you can never really know. All you can really tell is that in this case, the polygraph agreed with the jury. In this case, the polygraph didn't agree with the jury. But juries are fallible as well. So you can never really tell how accurate the polygraph actually is in the real world rather than lab studies.

Perhaps the easiest way to visualize this is by talking through the equipment that you have attached to you when you have a polygraph test done. So the first thing that you will notice is there's a blood pressure cuff wrapped around your arm. So that's measuring your pulse and also your blood pressure. So how fast your heart is beating and what your blood pressure is doing at the same time.

Perhaps the easiest way to visualize this is by talking through the equipment that you have attached to you when you have a polygraph test done. So the first thing that you will notice is there's a blood pressure cuff wrapped around your arm. So that's measuring your pulse and also your blood pressure. So how fast your heart is beating and what your blood pressure is doing at the same time.

Perhaps the easiest way to visualize this is by talking through the equipment that you have attached to you when you have a polygraph test done. So the first thing that you will notice is there's a blood pressure cuff wrapped around your arm. So that's measuring your pulse and also your blood pressure. So how fast your heart is beating and what your blood pressure is doing at the same time.

Then the second thing you'll have is you have two bands wrapped around your chest, one to measure your breathing around the kind of higher up your chest and then one around your diaphragm for lower down. And those are measuring your breathing rate.

Then the second thing you'll have is you have two bands wrapped around your chest, one to measure your breathing around the kind of higher up your chest and then one around your diaphragm for lower down. And those are measuring your breathing rate.

Then the second thing you'll have is you have two bands wrapped around your chest, one to measure your breathing around the kind of higher up your chest and then one around your diaphragm for lower down. And those are measuring your breathing rate.

So how fast you're taking an air and it's thought that liars might hold their breath while they're formulating a response to a question that they know they're going to have to lie on or things like that. And then the final thing is called galvanic skin response, which is basically sweat. So this is usually attached to the fingertip and this measures how much you're sweating.

So how fast you're taking an air and it's thought that liars might hold their breath while they're formulating a response to a question that they know they're going to have to lie on or things like that. And then the final thing is called galvanic skin response, which is basically sweat. So this is usually attached to the fingertip and this measures how much you're sweating.

So how fast you're taking an air and it's thought that liars might hold their breath while they're formulating a response to a question that they know they're going to have to lie on or things like that. And then the final thing is called galvanic skin response, which is basically sweat. So this is usually attached to the fingertip and this measures how much you're sweating.

So each of those measurements will have a corresponding line on the polygraph chart. And then the examiners will learn to interpret those lines in tandem to look for kind of signs of what they consider to be lying.

So each of those measurements will have a corresponding line on the polygraph chart. And then the examiners will learn to interpret those lines in tandem to look for kind of signs of what they consider to be lying.

So each of those measurements will have a corresponding line on the polygraph chart. And then the examiners will learn to interpret those lines in tandem to look for kind of signs of what they consider to be lying.

Yeah, that's right. Yeah. So and actually, the technology hasn't changed since, you know, the 1920s, really. So in the initial one, yeah, you'd have four different lines on the chart. And then it's the kind of combination of those lines that will appear on the chart, you know, ink on paper or nowadays it's on a computer screen.

Yeah, that's right. Yeah. So and actually, the technology hasn't changed since, you know, the 1920s, really. So in the initial one, yeah, you'd have four different lines on the chart. And then it's the kind of combination of those lines that will appear on the chart, you know, ink on paper or nowadays it's on a computer screen.