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Poyser said Vallejo police plan to do the same if a Zodiac sample is obtained.

"We are having (the evidence) retested, and then we will go the routes we can," he said.

However, science now has advanced to allow a clean grab of the DNA.

Poyser also said Allen was known to have asked other people to lick stamps and envelopes for him, claiming he didn't like the taste of the glue.

"They were confident they would be able to get something off it," Poyser said.

He said the envelopes had been sent to the lab a few months ago, before Joseph De Angelo, who is suspected of being the East Area Rapist, was caught after investigators used a DNA profile run though an open-source database.

Poyser declined to identify the lab, but said it would attempt to obtain a full DNA profile from saliva on the envelope flap and stamps.

Even if Allen doesn't prove to be the Zodiac, Poyser said he believes it was someone familiar with Vallejo, and perhaps with a law enforcement or military background.

He pointed out that the first four victims all were shot in rural areas likely only known to locals.

He also said that Ferrin, the 22-year-old woman shot and killed in Blue Rock Springs Park, may have been known to the killer.

The Zodiac Killer roamed Northern California from December 1968 through October 1969, but was never caught despite at least one close run-in with police.

He is known to have attacked seven victims — in Benicia, Vallejo, Lake Berryessa and San Francisco — killing five and leaving two survivors.

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Arthur Leigh Allen, a former elementary school teacher and convicted child molester who lived in Vallejo, long was considered a top suspect.

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