Humans have many positive qualities, but probably honesty is not one of them.

As a species, we lie constantly.
Let's say you're okay when we are sad, sick people give us for not working, we say to our partners that we will love them "forever" when they really mean "until next summer."
Once you start thinking about how many bales tell everyone-including your friends and people you love-every day, it is natural to wonder how you can do to find them.
Fortunately, there are experts who spend their life doing just that.
We contacted a few for us to give advice on the subject.
AN EXPERT BODY LANGUAGE
David Alssema is a language expert body that I was very happy to hear over the phone.
It is able to decipher the meaning of the words of someone just by looking at his eyes and gestures he does.
In practice the law and your mind, and does a little 'fear.
"When it comes to identifying a lie, the voice is a good indicator," he said.
But the words that come out with peace of mind are probably true.
Alssema explained to me that it takes very little to learn to tell who is lying and who is telling the truth practicing to make the case to where it is watching your interlocutor.
The eyes of a person tend to look left or right, depending on whether this is trying to remember something or inventing out of whole cloth.
"As you know a person, you know which way to look when trying to remember something and where to look when mind.
So if he is telling the truth, you know it right away because they do not exist and will look from a certain part.
If you mind, you'll know why the hesitation and look the other way. "
To figure out which side looks when mind and when he tells the truth, just ask a person three questions: how was his day, though it was hard and what to do in the weekend.
"The first two questions concern the past, so will have to remember to answer.
The third is a future event.
Answering the first two questions, the look will be on one side; the third the other, "he explained Alssema.
"Over time we get to know our friends and it becomes an unconscious thing.
But if you know a person for thirty seconds and you want to figure out if lying or telling the truth, these three questions are very useful. "
In addition to this technique, there are simpler indicators to consider.
If a liar thinks he is not believed, usually it touches or scratch your neck and neck.
"It indicates uncertainty," said Alssema.
Julia Robson is a former agent who now runs Online Investigations, a company specialized in investigating unfaithful wives and husbands on behalf of the spouse.
According to him, in relationships lies are very common.
Talking with her it was clear to find out if your partner is lying to you is not impossible.
First of all, the instinct warns you immediately if there is something wrong in your relationship-but unfortunately, when it happens we tend to do everything possible to ignore it.
"People are not going to be a detective because they want to know the truth," said Robson.
Robson says that often when you put in front of them the evidence of treason in the form of photos and video, both sides of a couple tend to be reluctant to accept the truth.
And although for others the truth is obvious, do not you ever say anything-because they do not think they have the right.
"I had a customer that every time he went to business events with her husband had the impression that her colleagues behaved oddly with her.
Of course, as it turned out, everyone knew that he had an affair with a colleague, "explained Robson.
In the case of people who are still in the first phase of a secret relationship, the signals are very predictable and all the cliches about it are true.
"They start to buy new clothes, enroll in the gym, lose weight, you better comb, try to show the best version of themselves," he explained.
"And often this can mean either that have already met someone and want to look good for him, or that you are looking around."
If your partner is acting strange, trust your instincts.
According to Robson, only one in 50 among those who follow ends well.
And frankly, I think that both invented this number to give me a bit 'of hope.
"Very, very rarely you can understand that the alleged traitor really wants to surprise his partner.
As a birthday gift or something, and that is what is elusive and behaves in a strange way, "he said.
It happens very rarely go by my client and bring good news. "
Once you have determined that your partner cheating on you, there is one last step: face and see his response.
"If you deal with a person who betrays will tend to become aggressive-and that's a sign that he're hiding something," said Robson.
"We always ask our customers to pay any attention to what happens next.
The partner's behavior changes?
Start spending more time at home, stop going to the gym?
These are all signs that you feel guilty that we are trying to cover the tracks and to calm the suspicions. "
Steve van Aperen is a machine operator of the truth that makes for FBI consultant, the US Secret Service and the police department of Los Angeles.
After finishing his training, he decided that you do not need a machine to detect lies.
"One day I thought it would be great to be able to tell if a person is lying without having to take the lie detector test?"
After working on 77 cases of murder and investigated two serial killers, van Aperen now travels the world to teach the police how to do without the lie detector.
"Research studies show that people are not particularly good at identifying the lies: we take an average of 49-53 percent of the time," he said.
"The reason is that we are influenced in evaluating the relationship we have with the person who is lying to us, and often we do not believe that there is lying.
But even these people are lying to us, and, moreover, can get away with relative ease.
Having worked with the lie, van Aperen knows it well: "one can not 'cheat' a lie detector," he said, "because it's just a tool that measures the blood pressure, the pulse, sweating.
At best, you can fool the examiner, who does not recognize the signs or make any questions in the right way. "
So, if we want to become human lie detectors have to be careful with language.
"The questions we need to be very clear, so as not to give leeway to the person we're looking at," explained van Aperen.
gave an example I: if someone had asked Bill Clinton if he had an affair with Monica Lewinsky, he could have answered 'no' and 'beat' the lie-because a relationship is something difficult to define and Clinton could think that between him and Lewinsky was not.
Instead making a more specific question on what he did and Lewinsky in the Oval Office, Clinton would be unable to process your request.
The next step is to watch the words and the body language of the other person-what they tell us?
They are interspersed with plenty of breaks, "um", "huh"?
If we are dealing with a particularly good liar, we have to be very careful about these details.
Van Aperen made me the example of missing or abducted children to parents: If they are innocent and have nothing to do with the fact, talk of his son in very personal terms and will behave as if it were still alive and not in danger.
"Subconsciously tend to use the present tense to express an expectation and a hope," he said.
"A person who is telling the truth does not tell you only what happened but also what he thought at the time and what feelings and emotions he experienced.
A liar rather not do: I will tell only the story and will try not to show emotion. "
If you suspect that someone is telling a lie, keep pressing it to make it go into the details.
If he is a liar, every answer will have to invent another lie that does not contradict with earlier-a difficult and stressful task, and you will realize.
"No matter how it is prepared, a liar can not imagine any questions that I can do," said van Aperen.
"So it will be forced to invent something, to contradict, and to create a false memory that has never existed."
With a little 'exercise, humans are capable of noticing when you are lying.
If you trust your instincts, you can easily identify the most blatant lies.
But sometimes instinct is not enough and other times we do not want to trust instinct-especially when it tells you that your partner is cheating on you.
It is at this point that come into play all these techniques: asking questions, observing the body language, to mind the way the other person speaks and breaks it does.
Be careful, because every detail is potentially a signal.

From Vice