It's useless even then. The severity of punishment has virtually no effect of rates of DUI reoffense. Those that can learn to not do that learn from the simple matter of being arrested and having to go through the whole legal thing. Those that can't learn from that, don't, and typically go on to reoffend on an ongoing basis until they either quit drinking entirely, quit driving entirely, or both when they die. It basically doesn't matter what the punishments are, or how severely they ramp up; the only REAL influence from 2nd offense on is that it's tough to get arrested for DUI if you're already in jail at the time. Even taking away licenses and mandating interlocks on cars doesn't really help.