The Zodiac Killer

A range of individuals have been accused of being the zodiac. The d and a sample tested against allan's had actually been obtained from the outside of one of the zodiac stamps. This meant the sample could have come from any number of individuals who had handled the mail in addition to the real zodiac killer. Even if allan was responsible for zodiac letters, it's possible that he didn't lick the stamps himself. Several of allan's acquaintances have since reported that he often asked them to lick stamps for him, as he couldn't stand the taste.