Investigators hunting for the so-called Golden State Killer subpoenaed a genetic website a year ago while investigating an OR man who was misidentified as a potential suspect.
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.
Those samples are expected to return in a matter of weeks.
Stephan said Thursday that unsolved cases may be linked to the crimes.
Decades after a crime spree that sowed fear in communities throughout the state, authorities last week tracked down the suspect by comparing genetic profiles from genealogy websites to crime scene DNA, according to prosecutors. Authorities suspect he committed at least 12 murders and 50 rapes in California between 1976 and 1986.
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'There's no basis to stop the execution of the search warrant, ' he said.
"I'm listening and I'm thinking, how can I use this technique in my other big case?" he told the Times. He is accused of being the criminal known as the Golden State Killer or East Area Rapist, who terrorized California in the 1970s and '80s. DeAngelo also is suspected of committing more than 45 rapes. Another man, Craig Coley, was recently cleared of those crimes after spending 38 years in prison in the murder of a 24-year-old college student and her 4-year-old son in 1978. The letters he sent to local newspapers to boast about his work and taunt investigators became legendary, complete with ciphers that he claimed would reveal his identity if solved. Poyser said recent advances in DNA testing prompted investigators to seek a match on two of the killer's letters. He said users should remove their DNA from the database or not upload it in the first place if they have concerns about how it will be used.
The 2007 movie "Zodiac", starring Jake Gyllenhaal and Robert Downey Jr., renewed widespread interest in a case that has always had a cult following of amateur detectives and cryptographers who sought to crack the killer's code.
"There's a formula to follow", Voigt said.