In the US each state has different rules regarding medical conditions that affect drivers licensing. If false information is given and an accident occurs not only will that person be held responsible (even if the accident wasn't there fault) to a certain degree and they will also be criminally charged usually a misdemeanor offense. Medications that influence judgement, reflexes and are known to cause any kind of cognitive impairment will be looked into and likely used against the person even if they weren't the at fault driver. Insurance companies will also reduce any benefits or fight any amount owed if the driver (at fault or not) is found to have any of these medications in there system, even if they are prescribed. Ultimately we are responsible to use good judgement and follow the laws provided under drivers licencing in each state.

This is why I taper down or withdraw from medications prior to driving when absolutely necessary.

It is each of our responsibilities to protect the lives of others when we know that our judgement/ability is impaired, especially knowing that our actions (if impaired) could cause injury or worse for them to end up in our shoes.. that would be terrible.