Interview with Arthur Leigh Allen
Arthur Leigh Allen: Though there were many suspects in the Zodiac case, Arthur Leigh Allen was considered the "most leading" suspect because every clue pointed to him, but the police still didn't have enough evidence to put him in jail for the crimes. Much of the evidence linked to him being the Zodiac murderer, especially the evidence found in Allen's home during a police search warrant. The only evidence found against Arthur being the Zodiac was that his handwriting did not match that of the Zodiac's.
Some evidence found:
Bruce Davis : Believed to be a Zodiac suspect, but did not fit the profile, He had long hair during the time of the Zodiac's murders, which contradicts a witness' account that the Zodiac had a crew-cut. He was a member of the Charles Manson family. As a result, all male members of the Manson family were investigated and eliminated as Zodiac suspects. Also, his handwriting didn't appear to match that of the Zodiac's.
Jack's Stepson Speaks
" Police had such a hard time finding the zodiac because they had so many people calling the station with thousands of possible suspects names." Jake Wark.