Full spectrum or broad spectrum distillate for cartridges?

I’m in the R&D phase of starting a CBD cartridge company in North Carolina. I’m trying to decide on using full or broad spectrum distillate. Will I limit my customer base by using full spec because of those who might fail a drug test or is that just a myth? Also is there any medical benefit to keeping the negligible amount of thc in the finished product? Any help is appreciated.