Oh and of course theres the fact that if there was a huge DNA database then people would start planting DNA and being even more clever, hence rendering the database pointless. Example:
Quote:
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The value of DNA evidence has to be seen in light of recent cases where criminals planted fake DNA samples at crime scenes. In one case, a criminal even planted fake DNA evidence in his own body: Dr. John Schneeberger of Canada raped one of his sedated patients in 1992 and left semen on her underwear. Police drew Schneeberger's blood and compared its DNA against the crime scene semen DNA on three occasions, never showing a match. It turned out that he had surgically inserted a Penrose Drain into his arm and filled it with foreign blood and anticoagulants.
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Once cases like that start happening, how can you use DNA as reliable evidence..