n. ~ The legal principle that an original is superior to a copy. Notes:  If the original is available, a copy generally will not be allowed as evidence in a trial. The requirement is detailed in the F [..]

The legal principle that in evidence, an original is superior to a copy, due to the difficulties frequently encountered in authenticating copies. According to the Federal Rules of Evidence, and simila [..]

see evidence

Best evidence refers to a rule of evidence that requires an original of a writing, recording, or photograph in order to prove its content. Where the best evidence rule applies, copies of the original [..]

Primary evidence; best evidence available. Evidence short of this is "secondary." E.g., an original letter is the best evidence; a photocopy is secondary evidence.

Primary evidence; the best form of evidence available. Evidence short of this is “secondary.” For example, the original of a letter is the “best evidence,” while a photocopy is “secondary evidence.” [..]

Primary evidence; the best evidence available (i.e., production of an original letter is the "best evidence" that a letter exists).

Primary evidence; the best evidence available. Evidence short of this is “secondary.” That is, an original letter is “best evidence,” and a photocopy is “secondary evidence.”