Where did you read that? I've been searching. I'm trying to compile some data on the test results to show how inconclusive they are. Everything I've found contradicts what some other article states regarding PEth levels.

For example, one article I found says that 100–500 ng/mL is a "very low" positive and could result from Previous heavy drinking (1–3 days), previous light drinking (12–36 hours), recent “extraneous exposure”.

However, another article states that "A positive PEth result is a reading of over 20ng/mL or above. This is equivalent to excessive alcohol abuse. It is considered that a result of over 100ng/mL is very strong evidence to suggest heavy binge drinking." It also says that Research has indicated that a PEth test can differentiate between incidental exposure (such as hand sanitizer) and the intentional consumption of alcohol.

So which is it? And where did this mystical 20 ng/mL cutoff come from? and if that is the "positive" cutoff how can 100 ng/mL be "very low positive"? This test is bunk. I am too new to this forum to be able to post the article links....sorry.