I don't see this study as strong evidence. They only studied TWO military bases and compared the rate of Parkinson's. There could be any number of environment

I don't see this study as strong evidence. They only studied TWO military bases and compared the rate of Parkinson's. There could be any number of environmental differences between these two locations besides the TCE levels in the water. The other issue is that there is an active class action lawsuit about this exact military base. When a study is published that directly reinforces the claims of one side of an active lawsuit, you always need to be cautious about taking it at face value. There could be some conflict of interest or even just sympathy from the scientists that introduces bias in their research methodology.