...their report states that the ethanol reported in these cases are from post-mortem ethanol formation and not from the ingestion of ethanol.
Further to that:
Ethanol analysis is one of the most common tests performed on forensic specimens. The presence of ethanol in aircraft accident victims constitutes an important part of both aircraft accident investigations and litigation. Using modern analytical techniques, there is little doubt as to the quantitative amount of ethanol present in a postmortem specimen. The origin of the ethanol detected, however, is an important variable that must be considered when interpreting ethanol results in postmortem specimens.
Many species of bacteria, yeast and fungi produce ethanol and other volatile organic compounds as a byproduct of their metabolism. Candida albicans has been identified as the microbe most often responsible for postmortem production of ethanol in humans. This species of yeast is commonly found in humans in vivo. However, microbes not normally found in vivo, such as the Mucor species of mold, are commonly found in decaying organic matter and soil; they may be introduced from the environment if the circumstances surrounding death are violent, as is often seen in aviation accidents. After death, endogenous and/or exogenous microbes begin rapidly consuming glucose and other nutrients present in the body and produce ethanol and/or other organic volatiles as metabolic byproducts. Under optimal conditions, substantial concentrations of ethanol may be formed within hours of death.
Source:
http://www.faa.gov/data_research/res...media/0404.pdf