Yes. You will certainly go to jail if you are have medication, illicit drugs or alcohol in your system. You will go to jail if it's found that you were being reckless by speeding excessively or using a cell phone while driving.
You will also be held liable for injuries, emergency services, medical bills, missed work, pain and suffering. If your insurance policy doesn't cover the full amount of a person's settlement, you will be sued and your wages will be taken until you finish paying what you owe. The only time that a pedestrian is at fault is when they are jaywalking.