think horses, not zebras.
That's an old axiom used to teach doctors the simple logic of diagnosis. Go for the more obvious or most likely answer, not the exotic.
While people have frequently looked to Argentia as a site for contamination by everything from nuclear weapons to mysterious biological germ warfare bugs, everyone missed a really obvious point.
At all US-owned facilities in Canada, the Americans would have used a variety of pesticides and herbicides that today are known to be dangerous. The sites are scattered all over and include both the well-known bases and the lesser known PineTree Radar sites.
As far as I know, not a single individual has ever taken a hard look at used of pesticides and herbicides around former American bases in Newfoundland and Labrador.
Oh, by the way, this Gagetown Agent Orange story was covered in detail about 10 years ago when I was a DND public affairs officer. Curious that it has come back now with such a vengeance.