Terminating an employee for drunk driving

One of our employees, who is required to drive a company vehicle to perform his duties, was charged at the end of his shift with impaired driving. Clearly he is now unable to fulfill his duties
|Canadian Employment Law Today

Question:

One of our employees, who is required to drive a company vehicle to perform his duties, was charged at the end of his shift with impaired driving. Clearly he is now unable to fulfill his duties. In the event we decide to discharge this individual, what should we say regarding the reason for discharge? My instincts tell me that discharging him for the impaired charge would open us up for problems and that we should state something along the line that he is discharged for being unable to fulfill his job. This is a non-union environment.

Answer: