Will companies hire with an open workers comp case?

They told me trucking companies won't hire me if I have an open worker's comp case. I do, I haven't been treated in a while though. I don't want to close it unless I absolutely have to in case I need treatment again. Does anyone know about this?

 

I was also wondering if you can smoke while driving. I hope this isn't a stupid question...

 

I finished treatment and actually thought it was closed almost a year ago. I was told they keep it open for up to 18 months. The school said to get my DOT exam and that would be fine. But if the case isn't closed, will that prevent me from getting hired once I finish school?

 

Thanks. I have some lingering back pain but it doesn't stop me from doing anything, just uncomfortable.