How do you detect lies?

It is always best to tell the truth first rather than have problems after you have told a lie. It can be found out as those who often lie forget the exact version of what was said in the first place. Also technology can pick this up as well via a lie detector machine. Just best not to lie at all.

It detects changes in your respiration and even your persperation. And your electrodermal activity, which is your skin. It also tracks cardiovascular tracing, which is your pulse, and your blood oxygen levels. The traditonal movies shows a graph, the line going up is a change in pulse, which means the machine detected a lie.

People beat it by learning to stay calm, or even convincing themselves they are telling the truth. This results in they're stats staying the same so it says they're telling the truth.

But on the contrary, sometimes innoeceont people tense up so much they get so nervous the machine detects a false lie.