I understand entrapment. If the cops know a bank is being robbed and wait outside and catch the theif, is that entrapment? Everybody leaving the bar ain't drunk and everybody leaving the bank ain't a thief, but we'll do whatever it takes to get the bank robber. Drunk driving is just as much a crime as bank robbing, especially if a drunk hits somebody and kills them.
My actual point before was that common sense should be used in the placement of the roadblocks. Around here, a state or county road checkpoint headed toward a rural area will catch a lot more than say I-20 coming out of Jackson, MS.
Penalties are too light also. I have a cousin who served 1 year of 5 for felony DUI. Ten years and 3 kids later, he's probably going to get 20 years for grand larceny he committed to support his meth habit. Now if he'd done his full five years for being drunk, he might not be a dopehead.
I feel worse for the wife and kids than him. Regardless, now the state of MS will feed his sorry carcass, and I'm sure the wife and kids will get assistance.