Are taco trucks inspected?

A reader writes Medford’s Oregon’s Mail Tribune to say:

I think taco trucks serve a better lunch than fast-food chains. But I don’t see any listed with your restaurant inspection scores. Does anyone regulate them, or should I eat at my own risk?

Chad Petersen, an environmental health specialist who inspects "mobile food units" for Jackson County Health and Human Services, responded,

"They’re basically a restaurant on wheels.”

Like bricks-and-mortar restaurants, the county’s 100-some mobile ones are licensed and inspected every six months. You don’t see their scores with other eateries’ because Oregon law doesn’t require they get one.

"They’re kind of on a pass-fail basis," Petersen says.