It is true that one can and does become intoxicated by absorbing alcoloholic beverages in their rectum. However, their blood alcohol content will still appear on a breathalyzer. The breath alyzer does not registered the amount of alcohol on the breath itself, but rather amount of alcohol in the blood stream. The body processes the alcohol and as a result it will appear in the blood regardless of how it is introduced into the system. It would, one would think, take something away from the whole "let's get frunk process" though to pour good booze up the intended drunkees ass.
I got my information by being licensed on the breathalyzer and being a licensed instructor to teach others the proper use of it. I am not licensed on the more modern Alcoanilizer.
Just for shucks and grins for those that do not know the old style breathalyzers were built by Smith & Wesson and were referred to as the Smith & Wesson 900 and later, when the improved version came along, the Smith & Wesson 900A. No serious S&W collection is complete without at least one breathalyzer built by Smith in it.[;)]