In October 2002, the ABC television show "PRIMETIME THURSDAY" supposedly compared Arthur Leigh Allen's DNA, to DNA obtained from a confirmed Zodiac letter. There was no match.
In 2003, due to Allen's alleged habit of having others lick his stamps and envelopes (he claimed the taste of glue made him sick), SFPD obtained a voluntary DNA sample from Allen's old best friend, Don Cheney. The results were negative.
In 2018, it was revealed that the DNA obtained back in 2002 from a confirmed Zodiac letter, was a DNA sample found on the outside of a stamp. Thus, the sample could have been the DNA of any number of individuals, including investigators.
Allen remains a top Zodiac suspect.
If you remember Mr. Allen, click here to contact me.