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How do you get a pathological liar to tell the truth?

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my belief is that you simply can't ...
you can tell when he's lying with body language.
Answers.com says to Try a truth serum:
(based on: truth drug?cat=health" class='external' title="http://www.answers.com/topic/truth drug?cat=health )
Drugs used as truth serums. Two of the most commonly used truth serums are members of the barbiturate" class='external' title="http://www.answers.com/topic/barbiturate drug class. Barbiturates are sedatives and hypnotics that are created from barbituric acid. They are divided into classes according to the duration of sedation" class='external' title="http://www.answers.com/topic/sedation: ultrashort, short, intermediate, and long. Ultrashort-acting barbiturates are used as anesthetics whereas long-acting ones are used to treat convulsions (anticonvulsant)" class='external' title="http://www.answers.com/topic/anticonvulsant). Barbiturates are controlled substances due to their high potential for abuse and for addictive behavior.
Sodium pentothal (pentothal sodium, thiopental, thiopentone) is an ultrashort-acting barbiturate, meaning that sedation only lasts for a few minutes. Sodium pentothal slows down the heart rate, lowers blood pressure, and slows down (depresses) the brain and spinal cord (central nervous system) activity. Sedation occurs in less than one minute after injection. It is used as a general anaesthetic" class='external' title="http://www.answers.com/topic/general anaesthetic for procedures of short duration, for induction of anesthesia" class='external' title="http://www.answers.com/topic/anesthesia given before other anesthetic drugs, as a supplement to regional anesthesia (such as a spinal block), as an anticonvulsive, and for narcoanalysis.
Sodium amytal (amobarbital" class='external' title="http://www.answers.com/topic/amobarbital, amylobarbitone, Amytal) is an intermediate-acting barbiturate. Sedation occurs in one hour or longer and lasts for 10 to 12 hours. Sodium amytal depresses the central nervous system. It is used as a sedative, hypnotic, and anticonvulsive and for narcoanalysis. When sodium amytal is used for narcoanalysis it may be called an "Amytal interview."
Scopolamine (hyoscine) is an anticholinergic" class='external' title="http://www.answers.com/topic/anticholinergic alkaloid drug that is obtained from certain plants. Anticholinergic drugs block the impulses that pass through certain nerves. Scopolamine affects the autonomic nervous system and is used as a sedative, to prevent motion sickness, to treat eye lens muscle paralysis" class='external' title="http://www.answers.com/topic/paralysis (cycloplegic), and to dilate" class='external' title="http://www.answers.com/topic/dilate the pupil (mydriatic)" class='external' title="http://www.answers.com/topic/mydriatic).
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How can you tell if someone is a pathological liar?

Pathological liars - or "mythomaniacs" - are people who engage in objectively puposeless story telling behavior. The stories they tell are not the products of delusions and se

Are you a pathological liar if you tell a lot of lies for no reason?

Don't fall into the trap of trying to label yourself or someone else and treating mental health issues like physical disease. If you lie and that behavior is pathological (cau

How can you tell when a pathological liar is telling the truth?

The truth is in the details. When he (or she) includes numerous unrelated, small details that don't add any extra "luster" or "sparkle" to the story you're being told (remembe

How can you tell if someone you know is a pathological liar?

Answer   I would have to say that you just have to be around them long enough. Check out what they say to you. Ask about what they said earlier. Eventually they will star

Do pathological liars ever admit they are liars?

Do Pathological Liars Admit They Lie? Chronic liars are most commonly found among those who have Antisocial Personality Disorder, although some liars also suffer from factitio

Who are pathological liars?

Pathological liars lies on a regular basis and is unable to control their lying despite of foreseeing inevitable negative consequences or ultimate disclosure of the lie. .

What is the difference between a pathological liar and a liar?

  Answer     Almost everyone lies occasionally. Usually for a reason: too keep from hurting someone's feeling, to stay out of trouble, to keep from being embaras

What can you do for a pathological liar?

Take everything that they say with a grain of salt.(Don't believe anything they say) To get them help, you can call your local mental health clinic and they should be able to

When do pathological liars tell the truth?

Pathological liars are those who tell lies at every given  opportunity and it is a way of life for them. As such, pathological  liars never tell the truth because they are i

What the definition of a pathological liar?

While virtually everyone may tell a lie at times, for various practical reasons, a pathological liar is a mentally ill person who feels compelled to lie even when the lies do

How you tell if someone is a pathological liar?

The best way to tell if someone is a pathological liar, is to catch  them in their lies. If you cant determine that they are a liar,  it's best not to trust them until they