This study, which indicated that a detectable amount of alcohol was found in 21% of bicyclists involved in fatal accidents, would have more significance if there was some mention made of what percentage of all adults, or even NYC adult bicyclists who haven't been in fatal accidents, have some unspecified amount of alcohol in them during their waking hours.
The article was clear to indicate that the study drew no conclusion if the bicyclists' alcohol levels had any bearing on their accidents.