People whose reaction time is impaired (that is what we are really talking about), regardless of reason, should receive the exact same punishment because they are exactly the same risk to others. We could, with great ease, develop a very cheap device that would do exactly that but we don't really care about actual safety that much. Revenue is so much more important.
Actually the person I was responding to said 'driving erratically'. That's very different from impaired reaction time. LOTS of people drive with impaired reaction time. Have you ever driven drowsy? Texted, made a phone call, or done
anything with your phone? Looked for something in the back seat? Eaten? Drank? No, I'm sure your hands at 10 and 2 with your mirrors adjusted and gaze fixed on the horizon.
To reiterate, I'm not saying we should tolerate drunk driving. It's well established that drunk drivers pose a risk to others, and it should not be tolerated. I'm just saying that at this point the penalties are absolutely fucking Looney Tunes.
You know what is tolerated? Older drivers, even though they also pose a greater risk to others.
http://www.cdc.gov/motorvehiclesafety/Older_Adult_Drivers/adult-drivers_factsheet.html
Should we start taking people drivers licenses away when they turn 75? Of course not. What we need to do is stop pretending that everyone that poses a slightly greater risk to us needs to lose their license for a year or go to prison.
The dude driving 120 MPH, weaving through traffic, severely inebriated? Yeah, put him in jail. But that's
not just drunk driving.