Three people who had heard the Zodiac Killer's voice, Nancy Slover, David Slaight and Bryan Hartnell, were confident that the caller was not the man they had heard during their respective encounters with the killer. A fourth person was absolutely certain, because he was about to compose a 340 cipher denouncing the caller to the Jim Dunbar Show as a fraud, by stating "That wasn't me on the TV show". Many have found it strange that the Zodiac Killer decided to encode this denial, when he could have simply written it into the Dripping Pen card that accompanied the cipher. He clearly expected this cryptogram to be decoded fairly quickly as the message was contemporary, and of diminishing value as the years ticked by.
However, his method of encoding such contemporary information to highlight that it wasn't him on the TV show, thereby confirming that the Jim Dunbar Show caller was an imposter, was to be repeated eighteen months later. Another cryptogram would be mailed to the San Francisco Chronicle in about May of 1971, harboring a hidden message that was again contemporary in nature, while calling out an imposter. This time though, the tables would be turned. On this occasion, the Zodiac Killer would be calling out a "phony", when in realty he was the imposter and the person he was addressing was the real killer. This stemmed from his false claim that he was the murderer of Kathy Snoozy (15) and Deborah Furlong (14) in San Jose. These two young girls were brutally stabbed on August 3rd 1969 and claimed as Zodiac victims when he mailed the Dripping Pen card on November 8th 1969. He would write "Des, July, Aug, Sept, Oct = 7", thereby falsely inflating his victim count to engender more terror over a wider area.
The newspaper article stated "He was immediately advised of his rights concerning any statements he may make and legal representation to which he is entitled, the detectives said. Werner was then taken to the scenes of the crimes. Late yesterday he was undergoing questioning. The detectives would not reveal what statements, if any, he had made concerning the killings of the three girls". The Zodiac Killer was understandably horrified, because the two murders he had falsely adopted into his victim total for a year-and-a-half, were about to be handed over to someone else. Karl Francis Werner was ultimately charged (and later convicted) of all three murders, but the Zodiac Killer was having none of it, firing off a 148 character cipher and letter sometime in May (see below).