>I still see that as falling into the trap of requiring 100% perfection. Engineers tend to evaluate things as whether they're "good enough".
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>Every jurisdiction has drivers who are absolute menaces. Multiple drunk driving convictions, driving while prohibited, driving causing death or serious injury.

With specialized police forces for this or that kind of crime at this or that level of territorial organization, there are lots of cracks these can fall through. In the Hampton Roads area, which has seven cities shoulder-to-shoulder, a guy was finally caught DUI when he hit the toll booth on the bridge. Then when his photo hit the local TV channels, it turned out this was his 22nd offense of the kind in the recent years. At least he got caught that many times, but by a different unit every time, and they all just made a note, booked the event and let him go - for that's the policy for the first offense. Each was the first time for the unit in case, and they obviously don't share data. Which makes me wonder what happens if you don't know enough law to report to the right unit - or if it's via 911, what happens if they make a wrong call and send the wrong kind of police? Likewise, what if ATF sees a theft or a beating? Just curious.