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发帖数: 43471 | 1 https://www.brodenmickelsen.com/blog/why-polygraph-tests-are-not-admissible-
in-court/
If you watch any TV show about true crimes or a drama, you’ll often see
references to polygraph tests.
Given that the criminal justice system relies so heavily on people telling
the truth, many people wonder why lie detectors are not used routinely in
most cases.
However, in Texas as most states, polygraph results are not admissible in
criminal trials.
Although polygraphs are also called lie detectors, in reality a polygraph
machine does not have any reliable capacity for detecting the truth or
falsity of a statement. The machines measure a person’s biological
processes to determine if they are becoming stressed out during
interrogations. Factors such as an increase in blood pressure or heart rate
are measured. While these may be indicators that a person is lying, they may
also simply indicate that a suspect is feeling pressurized by the
interrogation even if they are telling the truth. Even if you ‘pass’ a
polygraph test, it won’t help you in a criminal trial.
Can You Be Forced to Take a Polygraph Test?
Although police use polygraph tests less frequently than in the past, you
might still be asked to take one after an arrest. Although psychological
pressure may be provided by investigators, you do not have to take a
polygraph test. Many people are not aware of their legal right to refuse.
If you refuse to take a polygraph test, some investigators may become more
convinced that you are guilty. However, you are just asserting your legal
rights and it won’t help you if you pass it, because the police may simply
believe you have beat the test rather than being innocent.
This does not stop many investigators from requesting a lie detector test,
often as part of a criminal investigation. There have been examples of
interrogators seeking to convince defendants that the lie detector has shown
results will be detrimental and they should confess.
Where Polygraph Tests Can be Used as Evidence
In Florida, California, Georgia and Nevada, polygraph tests can be used if
everyone agrees to it but there are different opinions on the test’s
accuracy. In California lawyers can present the results to the jurors and
allow them to make up their minds. Georgia allows defendants who suffer due
to a false result on a polygraph to sue the polygraph operator for damages.
Florida is the only state that can require some defendants to take polygraph
tests – previously convicted sex offenders in this case, although the test
results can’t be used in court.
Defendants should always exercise care if they are asked to take a polygraph
. You should never submit to an interview or a polygraph without first
discussing your case with a Board Certified criminal defense lawyer. |
