narco analysis test - An investigation technique. or deception detecting test used in Forensic laboratories to detect the fraud done by the accused person using 'TRUTH SERUM' or Sodium amytal.

1. S R AMRITHA
BSC BIOTECHNOLOGY
FLS Dept.
JSS UNIVERSITY
MYSURU

2. OVERVIEW
1. INTRODUCTION
2. HISTORY
3. WHAT ARE NARCO-ANALYSIS TEST
4. TEAMS OF EXPERT
5. TRUTH SERUM
6. EFFECT OF DRUG ON CNS
7. MECHANISM OF ACTION
8. PROCEDURE IN NARCO-ANALYSIS
9. CASES
10.LEGAL STATUS
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3. INTRODUCTION
•The main intend of narco-analysis test is to extract information from the
accused when he is in the hypnotic state. And the entire responsibility of this
procedure is on the doctor & the forensic psychologist.
• Narkc = aneasthesia / torpor
•Horseley coined the term
•Robert Earnst House –Father of truth serum
•It’s a process of abreaction or catharsis.
•It is also known as Truth Serum or Drug Hypnosis or Narco interview
Technique
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4. HISTORY
•It first reached the main stream in 1922, when Robert
House, a Texas obstretrician used the drug Scopolamine
on two prisoners.
•American Armed Forces & Intelligence Agencies
continued to experiment with Truth Drug mostly
Barbiturate during & after war.
•It was widely used in 1940’s
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• Marijuana was used as a truth serum by the office of Strategic Service (OSS) , a US government
intelligence agency formed during World War II.

6. WHAT ARE NARCO ANALYSIS TESTS ?
The subjects imagination is neutralized by making the accused semi-
conscious. In this state , it becomes difficult for him to lie & his answers
would be a restricted facts he is already aware of. Expert inject the
subject with SODIUM AMYTAL.
The dose is dependent on the Peron's sex, age ,health & physical
condition. A wrong dose can result a person going into a coma, or even
death.
The answers are believed to be spontaneous as a semi-conscious
person is unable to manipulate the answers.
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• In disputed paternity
cases.
• Insurance claims
• Pre employment screening
Civil
purpose
• To testify the truth in
statements made by
offenders ,criminals &
suspect.
Criminal
purpose
Role

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Kasab’s Narco-test & his confession
about Mumbai terror attack on Taj Hotel

9. TEAMS OF EXPERT
Clinical Forensic Psychologist
Psychiatrist
Physician
Anaesthetist
Audio-Videographer
Writer
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ECG Monitor
Emergency
medical
facilities
Anaesthesia
machines
Pulse
Oxymeter
Oxygen
cylinder
Operation Theater

11. TRUTH SERUM
Psyhoactive drugs used in an effort to obtain information from subjects
who are unable or unwilling to provide it.
These include,
Scopolamine
 3-quinuclidinyl benzilate
Midazolam
Flunitrazepam
Sodium thiopental
amobarbital
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12. EFFECT OF DRUG ON CNS
•Principle mechanism is the positive allosteric modulation of
GABAA receptors.
•GABA is the principal inhibitory neuro transmitter in the
CNS. Barbiturates bind to the GABA receptor at the beta
subunit, which are binding sites distinct from GABA itself.
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13. MECHANISM OF ACTION
• Barbiturate +GABA
• Activation of GABA receptor
• Opening of chloride channel
• Increase the duration of GABA gated channel opening
• Hyperpolarization of cells
• Depression of CNS
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14. PROCEDURE IN NARCO-ANALYSIS
•Pre Test Interview
•Pre-Narcotic State
•Semi-Narcotic State
•Post Test Interview
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15. PRE TEST INTERVIEW
•Individual is explained regarding the
whole procedure & informed consent is
taken
PRE-NARCOTIC STATE
•Anaesthetist induces narco & maintain
the pre-narcotic state throughout the
interview
•Drug is injected till the person appears
relaxed & in a state of good contact.
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16. DRUG & DOSAGE
• 5% Amytal
• 5% Pentothal
• <1cc/min
• 150-350mg
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17. SEMI-NARCOTIC STATE
Individual is allowed to sleep off & allowed to wake up on his/her off
Forensic psychologist or psychiatrist facilitate the interview
Nystagmus observing by testing examinee’s eye with finger
Complete narco interview is audio-video recorded & also written.
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18. POST TEST INTERVIEW
•Memory is checked
•Individual is allowed to know what he/she has spoken during
interview
•Individual experience more relax & anxiety free state.
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19. CASES WHERE IT HAS BEEN AID
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Veerappan case
2001
Nithari killers 2006 Abdul karim telgi
2007
Banwari-devi 2011
Arushi talwar 2011

20. LEGAL STATUS IN INDIA
•On 5th may 2010 Supreme Court Of India
concluded following point with respect to
this test:
•Article 20(3) of the Indian Constitution “ No
person accused of any offence shall be
compelled to be a witness against himself”
•The test result can’t be admitted as evidence
if they have been obtained through the use of
compulsion.
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22. DRAWBACKS OF NARCO ANALYSIS TEST
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23. REFERENCE :
• DR SAURABH BHARGAVA
• DEBASISH GANGULY
SLIDE SHARE.IN
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