I'm not going to argue the other points, because I've given my opinion. I just want to say that in 1969, there would be no reason for Allen, or anyone, to use "someone else's DNA," by which I assume you mean getting someone else to lick the envelop, to deliberately mislead police, because there was no way for Allen to know that 28 years later, police labs would be able to use DNA to catch criminals-- and at any rate, it would be ten years or so after that before they could extract DNA from an envelop flap.
But, if he were worried about having contact with the envelop and were just generally trying to avoid touching it, he would probably do what secretaries, who often have to moisten dozens of envelopes a day, do, and moisten it with a sponge. Getting another person to lick it would be involving another person, who then might run to the police with the story.
There was some DNA on the envelop, so someone licked it, and it wasn't too degraded for a match. People who deal with DNA samples professionally can tell when a sample is degraded, and not useful, and will not attempt a match, or will attempt one only cautiously (some mildly degraded samples can rule someone in, but not out). The DNA did not match, because it was someone else.
But, if he were worried about having contact with the envelop and were just generally trying to avoid touching it, he would probably do what secretaries, who often have to moisten dozens of envelopes a day, do, and moisten it with a sponge. Getting another person to lick it would be involving another person, who then might run to the police with the story.
There was some DNA on the envelop, so someone licked it, and it wasn't too degraded for a match. People who deal with DNA samples professionally can tell when a sample is degraded, and not useful, and will not attempt a match, or will attempt one only cautiously (some mildly degraded samples can rule someone in, but not out). The DNA did not match, because it was someone else.
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