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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

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

How can you tell if you're a pathological liar?

Pathological liar is hard to noticed, it often exaggerate issues. Person may not be lying deliberately. He or she would think and believe in their lies completely. Their daily

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

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

How do you tell if you are a pathological liar?

The definition of a pathological liar is a person who is compelled to lie and deceive regardless of the benefits or costs to that person for doing so. For instance, a patholog

Does a pathological liar grossly distort facts or just make up lies tell and them as if they were telling the truth or is factual?

You can't tell if a pathological liar is lying. They are sociopaths  and have learned to mimic the behavior of truth. I know! I lived  with one of the most skillful highly f

How do you make a liar tell the truth?

In my experience there are no spells, brews, elixirs, etc that can force someone to tell the truth. Magic should not be used to coerce someone into doing anything they do not

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