ActionCode|4| : What is an evidence?

In the next " Crime Scene Procedure" we will talk about the investigators roles, the word "evidence" will be used, so it will be better to define it first.
 

   Evidence is a piece of information that supports a conclusion. The classic example is from the law court: means, motive and opportunity. If the defendant had the means to commit the crime (say, owned a weapon to commit the murder), a motive or reason why he or she would want to commit the crime (would inherit $35,000,000 with the victim dead), and the opportunity to commit the crime (was alone with the victim when he died with the expectation of getting away undetected), and the evidence (there's that word again) proved the above, then it would be a reasonable conclusion that the defendant committed the crime. Of course, the court requires more evidence: for example, that the crime was committed with the weapon (which requires forensic and ballistic evidence), and that the defendant was the one that used the weapon beyond reasonable doubt. Nonetheless, the point is clear. For a conclusion to be acceptable as true, there must be evidence to support it.

Scots Law -wikipedia-
   An important part of the Law of evidence is that of corroboration in Scots law. This is a vital element of the law to protect the accused from unjustly being convicted. Each essential fact (facta probandum ) of a case must be corroborated by two independent pieces of evidence and one witness alone cannot corroborate an essential fact, it must be corroborated by a second independent source. Essential facts are those listed in the indictment and used to charge the accused and the sources of evidence come in many forms, such as documentary, DNA, forensic and report evidence or from a scientist or forensic pathologist.
   Corroboration will normally include direct evident, such as an eye witness and could include circumstantial evidence, which is evidence that has a relationship to the crime and can assist in 'proving' the essential fact also known as indirect evidence. Two pieces of indirect evidence which both relate to the same incident, may mean that direct evidence is not required, this is known as evidential facts and they do not require corroboration. The essential facts will vary with each case and the complainer is likely to lose, if an essential fact which is vital to their case cannot be proven.

if you want to read more about "evidence" check this article :  public.wsu.edu/~taflinge/evidence.html
                          ( it's old but well written :) )

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