Operating a CMV with any measurable amount of alcohol in your system will result in an out-of-service order for:

If you are found to be driving with any detectable amount of alcohol in your system, but are still below the legal limit of 0.04 percent, you will put out-of-service for a period of 24 hours.

Wait, before you go

Ace Your Iowa CDL Written Test with our Guaranteed Cheat Sheet