ausrere
Pattern Altitude
I don't remember this mentioned in the last intoxilyzer class I took. Although, it has been a while, and the low carb diets weren't popular like they are now. Something to remember if you're asked for a breath sample though:
http://news.yahoo.com/s/nm/20070410/od_nm/virginatlantic_diet_dc_1
http://news.yahoo.com/s/nm/20070410/od_nm/virginatlantic_diet_dc_1