Is this taking place in the 1960s? So the Trails are only now discovering that lawn chemicals can hurt animals?! Yet, Mark apparently has a fully-stocked library of scientific research materials in the cabin that prove lawn chemicals are the culprit. Without testing? Why doesn’t Doc Davis have access to this material? He could have just looked it up, rather than waste time with bothersome tests and microscopic analyses.
Where do we go from here? Will Mark and/or Doc call in the proper authorities to take over the investigation? Not yet of course. The Trails will investigate on their own, I think, to get more evidence. At that point, they would call in the authorities. Somehow, I don’t think it will play out that way.