CJK 0028 - Traffic Stops and Crash Investigations CJK 0028 - Traffic Stops and Crash Investigations 28 con. hrs. Occupational This course covers traffic stops and crash investigations which require you, as an officer, to use proper procedures to ensure both your own and the public’s safety. These two tasks are tested on the State Officer’s Certification Exam. The course will provide you with the basic knowledge needed for the state exam as well as a basic knowledge level when you enter the field. Course Designations: (CH)