What question did this study set out to answer?

To investigate an outbreak of arsenic poisoning and identify the source of contamination.

Outbreak of Fatal Arsenic Poisoning Caused by Contaminated Drinking Water

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Epidemiologic investigation reveals arsenic poisoning in a family, suggesting serious public health implications.

To investigate an outbreak of arsenic poisoning and identify the source of contamination.
Detailed epidemiologic and environmental investigations of the family and surrounding areas.
Laboratory testing for liver function and blood cell counts.
Assessment of arsenic levels in water and soil samples.
Nine family members were affected, with gastrointestinal symptoms in eight and encephalopathy in four.
Two individuals succumbed to arsenic poisoning, measured at 108 ppm in the farm well.
Contamination likely resulted from leaks in the well casing and adjacent soil contaminated by pesticide.

Armstrong et al. (1984) studied this question.

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