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Cold case talk on Mr. Hopkins invisible semen

Dr. Mark Perlin spoke at the AISOCC conference this year about the Scott Hopkins murder trial, featured on CBS 48 Hours episode "Janet's Secret." Why was Hopkins found guilty, when the DNA showed his innocence?

How did Hopkins DNA get on Janet Walsh's clothing? Prosecutors conjured a crazy coincidence, ignoring established science. Perlin's talk "Justice denied: Mr. Hopkins invisible semen" explains what happened.

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