@donasmrs-- Actually, I've heard exactly the opposite, that saliva tests are more accurate than breath tests because saliva tests show an outcome that is closer to blood alcohol levels. But this was a claim made by a saliva test manufacturer, so they might be biased.
We have a secretary at our office who obviously has a drinking problem. Sometimes she has slurred speech and there is a strong alcohol odor. It's not even necessary to do a saliva test for her, but I'm curious about how much she drinks while in the office.