A person who is lying may exhibit several behavioral tells, such as avoiding eye contact, touching their face frequently, and having difficulty providing details without extra elaboration. They may also insist too strongly that they are telling the truth, change their tone of voice, or create physical barriers between themselves and the person they are speaking to. Dilated pupils and rehearsed, overly detailed responses can also indicate that someone is being deceptive.

1. How to Tell If Someone Is Lying
Vocabulary
Often times, a liar won't use the words "I" or "me," instead referring to himself/herself in the third
person in order todeflect blame or responsibility. Sometimes, he/she will leave pronouns out
altogether. For instance your boyfriend will say things like, "This guy was watching football," or
"Watching football!" instead of "I'm watching football."

2. Eye Contact
A liar usually has a hard time looking someone directly in the eyes while he/she is lying. It's
easier to lie while looking at the wall next to someone than looking right at the person

3. Touching of the Face
A person who is lying may touch his/her face a lot, especially the nose, ears, mouth and throat.
A liar won't usually touch his/her chest with an open hand, however.
Rehearsal
Usually, if you ask someone what they did last Tuesday, he/she have to stop and think about it
for a few moments. A liar, however, will have a story already planned out if he/she is trying to

4. cover something up. Unless the person you are talking to has an exceptionally good memory
and always launches into stories this way, this should be a red flag.
Expressions
If a person is lying about something that involves emotions, such as love, it should show on
his/her face. When a person fakes an emotion, it generally is only shown in the mouth. For
instance, someone can smile with his/her mouth, but it won't go all the way to his/her eyes if it is
insincere.

5. Thou Doth Protest Too Much
Liars will often insist that they are telling the truth and often. They will say that they "swear"
they are telling the truth or will start a statement with "to be perfectly honest." If you really are
telling the truth, you don't need to say all of these things. This is usually a sign of a guilty
conscience trying to hide something.

6. Extra Details
A liar will often give extra details that aren't really necessary. They think they are making their
case stronger, but in reality, the extra details just look fishy.
For instance, if you ask your boyfriend whose phone number you found in his pocket when you
were doing laundry, he could just simply say it is something to do with work and leave it at that.
But he might freak out and say something like, "I was at work, and Mike wanted me to help him
out with a project he is working on, so he gave me the phone number to an advertising company
so I could call them for him," and on and on. If the phone number really was for work, you didn't
really need to know all of those details.
Now instead of having a solid story, he has guilty written all over him.
Change in Tone of Voice
A liar will often unconsciously change his/her tone of voice when telling a lie, either higher or
lower than normal.

7. Dilated Pupils
When people lie, they get stressed; and when people get stressed, their pupils will often dilate.
If the darks of her eyes get bigger, she might be pulling a fast one on you.

8. Creating Obstacles
Liars may subconsciously put objects between themselves and the person they are lying to.
They may walk around to the other side of the table, try to speak to you from another room or
simply put their books or coffe cup between you on the table. This can also include their own
arms, as liars will often cross their arms over their chests.