That’s what I remembered, but also something about the context of there being no control group, i.e. people who had died (with or without Alzheimer’s) without any aluminum in their system.
This is from 1983, but I read it 4 or 5 years later:
http://www.straightdope.com/columns/read/195/does-exposure-to-aluminum-cause-alzheimers-disease
