Causing a fatality through negligent operation of a CMV will result in the loss of your CDL for a minimum of: Question Causing a fatality through negligent operation of a CMV will result in the loss of your CDL for a minimum of: Answers One month. Six months. One year. Three weeks. 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: Iowa Class A Knowledge Test