When I was buying black market CBD oil, I got offered some Delta 8 oil. Kind of wish I'd tried it now just to see what it was like, but I had a lot of bud around at the time and couldn't see the point. The guy I chatted to about it thought that maybe it wouldn't come up in a saliva or blood test because it wasn't delta 9 THC? Dunno whether that's the case or not.
Anyway it's in Oz for those wanting to seek it out.