There are 2 things wrong with quoting that as an argument:

1) Ride stops aren't unreasonable. There's a reason they occur, and they're usually held on holidays where people have been drinking. Thanksgiving, NYE, Halloween, superbowl sunday (just realized how close to each other all those things are in the year :) so the REASON is that more drivers are driving impaired on these days.

2) this isn't search, or seizure. They're not rifling through your drawers, they're asking you to exhale the air in your lungs, something you do once every second or so. And they're not stealing the air from you, as it doesn't belong to you, and they're not preventing you from getting air.

My opinion is, don't drive impaired, and you have nothing to worry about.

It may sound like the same sort of excuse people give about surveillance ("if you're obeying the law you have nothing to hide") but this isn't the same.

The argument against surveillance is that some unlawful stuff has had to happen in the past for the greater good (think underground railroad type stuff)... but driving impaired has never / will never be necessary for the good of mankind.