In all fairness, I think a tape that is from an unknown source is not admissable in a court of law as evidence
unless someone can testify they made the tape and indicate the circumstances under which it was recorded
otherwise you could end up with footage of Terminator being shown in a court, to convict Arnold of murder
I believe the same is true of a photograph - unless the photographer is available to testify.
BWT I heard the governement did NOT want to release the tape, maybe for this very reason - but word of its existance was leaked out.