"Learn from other people's mistakes," my old firearms instructor from the police academy said. "You'll never live long enough to make 'em all yourself."
Hundreds of prison inmates have been released from their sentences after DNA testing of
evidence. In 75% of those cases, there was also mistaken identification of the defendant by a witness.
Law enforcement learned that they had to change the way they show photo lineups and talk to witnesses--the double blind -- method has been adopted, and private investigators need to understand it in depth, for not only their own interviews and photo showings, but to conduct effective criminal defense investigations as well. 

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