The law does not have to say which drugs are involved.
Many medicines can affect the way one drives.
Alcohol can enhance some of the dangerous side effects of many drugs, even those that are prescribed by your physician or purchased over the counter. It is important that you check with your physician or pharmacist before driving after taking any medication. Almost any drug can affect a person's driving skill. This is true of prescription drugs, drugs you can buy over the counter, or illegal drugs. Taking any drug can affect safe driving.