Which of the following is NOT a medical risk assessment qualifier for drivers?

Medication history is indeed not classified as a medical risk assessment qualifier for drivers in the context of FMCSA guidelines. The medical risk assessment focuses on various factors that could impact a driver's ability to operate a commercial vehicle safely.

Symptoms refer to any physical or mental conditions that could affect driving performance, while behavior includes how a driver reacts under different situations and their general compliance with safety practices. Mental processing pertains to cognitive functions necessary for decision-making and reaction times while driving.

While medication history is important for understanding a driver's overall health and potential side effects that could impair their driving, it does not serve as a direct qualifier for assessing medical risks in the same way that the other factors do. Instead, it's often considered as a supplementary piece of information that may be reviewed but does not directly fit into the qualifiers that determine medical fitness to drive.