Causing a fatality through negligent operation of a CMV will result in the loss of your CDL for at least: Question Causing a fatality through negligent operation of a CMV will result in the loss of your CDL for at least: Answers One month. Six months. One year. Explanation A first conviction of causing a fatality through negligent operation of a CMV will result in the loss of your CDL for at least one year. This questions appears in the following tests: Idaho Class A Knowledge Test