Officials said he had been working as a handler at a brewery in Massachusetts.
The idea for "The Handler" came to Mr. Haddock during his work on "Da Vinci's Inquest," a procedural police drama whose central character, a cranky Vancouver coroner, was partly modeled after a real-life medical examiner who had also worked as a handler.
In addition, baggage handlers were asked supplementary questions about their work as a baggage handler.
He was cleared by security checks in December 2015 to work as a baggage handler at nearby Chambéry airport until April 2016.
Mr. Earhart, 34, arrived in Iraq in October to work as a dog handler for a bomb-detection company hired by Custer Battles.
Johnston, who has been a police officer for six years and had only recently started work as a dog handler, is expected to make full recovery.
Until Wednesday, he had appeared to be a secondary figure, with most of the focus on his co-defendant Russell Defreitas, accused as the mastermind of the plot to blow up the fuel tanks at Kennedy Airport, where he used to work as a cargo handler.
He talked about his Southern upbringing, his photography, his work as an art handler.
In order to validate the information on occupation, participants identified as baggage handlers in the registers and member directory were asked whether they had ever worked as a baggage handler.
Information on baggage handler seniority was measured by the question: For how many years, all together, have you worked as a baggage handler?
