It is important to be aware that DWI/DUI also applies to drugs. If you are driving while affected by illegal drugs, you’re treated as though you were driving drunk. You might also be facing legal problems with you drive after prescription drugs or even over-the-counter medications if they affect the way you operate the vehicle.

You drug usage cannot be measured in the same way as your alcohol usage. In most cases, this is not a problem, since most drugs that cause you to be driving unsafely are illegal. However, prescription drugs and over-the counter medications are not illegal, so in many cases this is a judgment call by the officer (unless your doctor specifically ordered you to refrain from driving). Be on the safe side – stay off the road if you have any drugs or medications in your system.