I read somewhere that it does help, and should definitely speed up the process. I have about a year gap from the last time I had UA, to the time I will be starting my new job. I read that since I already did my background checks, they will only really look at the past year without UA and it should only take a couple days to finish the new background check. I am not 100% sure where I found that information, but UA is UA no matter what plant or company it is. I will continue to look for where I found it, but I think your background check wouldn't take too long considering your UA is still current and active.