Driving under the influence, or DUI, is a serious charge. You could lose your license, get arrested, get your license suspended or revoked, etc. When you enter the courtroom with your DUI lawyer, you should have a really good defense. Otherwise, you may not like the punishment the judge will give you.
Emergency Situations after Consuming Alcohol
Emergency situations can occur at any time. Someone who is seriously injured and needs to get to the hospital right away, or a pregnant spouse is going into labor, both counts as an emergency situation. If you came home and had a few after work, and then had to drive because of an emergency situation, this might be a reasonable defense. Just make sure you can prove that you were at the hospital after you were pulled over by the police, and that there was no reasonable expectation that an ambulance could have reached you in time.
Your Medication Makes You Sleepwalk
There are several medications that can cause people to do strange things in an ambulatory sleep state. These incidents have been documented in order to remind patients that they should be monitored carefully for several weeks to make sure they do not do things like sleep-drive or sleep-eat. If you were pulled over or run off the road to force you to stop driving only for the officer(s) to discover that you were under the influence of your medication, this, too, might be a reasonable defense.
You Have Rare Medical Conditions That Mimic Being "under the Influence"
There are some rare medical conditions that can make people appear as though they are under the influence of drugs or alcohol. These conditions should be well-documented if you expect the judge to believe this defense. Get your medical records and documentation that shows you have been diagnosed with one of these rare condtions, and you have a good defense.
You Tested False-Positive for Drugs and Alcohol
Breathalyzers are not always fool-proof. Things like mouthwash and adult cough syrup can fool these machines. If you tested positive on the road with a breathalyzer, and you know for a fact that you were not DUI, demand a blood test when you get to the police precinct. Testing false-positive for a DUI and not receiving a blood test to confirm when you clearly asked for the test is a violation of your rights. A false-positive immediately proves your innocence.