Actually, research I read when I got my DUI in 2007 seemed to indicate the release of alcohol vapors into the air by the lungs can vary widely between persons, by as much as 20%.

...

I don't know about 49 of the states, but in Washington state, if you want something more accurate than a breathalyzer, you have to demand the police take you to the hospital to have blood drawn at your own expense. They are required by law to comply, but 99% of DUI suspects know nothing of their rights.

"There's only one of him, only 9 (or 15 or 30) bullets in that gun, and if we storm him he won't be able to reload. Sure, one or more of us could die, but we aren't going to sit back and let fear and the threat of violence rule our lives."