Seriously, my mind is blown here.
This opens up a good point - I'm all in favor of taking criminal history into account, so long as we're talking relevant history.
Take your example - if I'm hiring you to drive in the company car, then DUI (and worse, reckless driving) are relevant crimes. But if the job was "show up, sit in cubicle, keep servers running", without driving as part of the job? Then what do I care?
And even then, depends on the company and whether or not they're going to let you prove you're capable of managing your shit properly. My last job was as field service engineer, and it seemed like the entire field service crew all had a DUI on their record. But, as long as you show up to work sober and get shit done, they couldn't care less what you did off hours.
"I say we take off; nuke the site from orbit. It's the only way to be sure." - Corporal Hicks, in "Aliens"