A driver cannot be considered for an SPE if:

A driver cannot be considered for a Skill Performance Evaluation (SPE) if the deficit is progressive. This is critical because a progressive deficit indicates that the individual's condition is worsening over time, which poses a significant risk in terms of driving safety. If a person's ability continues to decline, they may not be able to maintain the necessary skills and reaction times required for safe driving, leading to increased chances of accidents and unsafe conditions on the road.

In contrast, deficits involving less than an entire hand or foot typically can be accommodated through specialized driving evaluations, provided the individual has sufficient functional ability remaining. Additionally, while deficits resulting from illicit drug or alcohol use are certainly concerning and could disqualify a driver based on the impact on their abilities, the direct reason for disqualification in this context is rooted in the progressive nature of a medical condition, as this aspect directly correlates with increased risk to public safety.