True or False: Only commercial drivers can be tested for substances other than alcohol.

The assertion that only commercial drivers can be tested for substances other than alcohol is false. In reality, drug testing can be applied to all drivers under certain circumstances, not exclusively to those operating commercial vehicles. For example, police can conduct substance testing during routine traffic stops if they suspect a driver might be impaired, regardless of the type of vehicle they are operating.

Additionally, employers, including those in non-commercial driving jobs, can conduct random drug testing as part of their safety programs. This is enacted to ensure a safe driving environment for all road users, necessitating that any driver, not just those in commercial roles, could be subjected to such tests. Thus, the correct answer underscores the broader application of drug testing beyond just the commercial driving sector.