I'll have to do some asking on the lab that did the testing, as I don't recall off the top of my head. Usually on these essays they charge per chemistry tested for. When we've been involved in the past it was to try to prove or disclaim a wrongful application accusation, and someone involved (farmer, agronomist, applicator) had an idea of what to look for. In this case with the neighbor, nobody had a clue, and the farmer wanted to know what was going on as this field had a residual issue the last time it was in potatoes (that time was glufosinate) so he ordered the test for everything. It took several weeks to get the results, and it cost enough that the owner wouldn't tell his manager what the total bill was.
I usually don't say too much on these topics because I'm a total hypocrite when it comes to chemical application, between my brother and I we ground rig, cropdust, mark-out for potatoes, and soil fumigate. After being involved in some of these essays, and seeing a general trend of more and more chemicals being needed by some of our customers, we have completely changed our philosophies on our own farm. Some of our herbicides are just spot sprays now, we won't allow soil fumigation on the spud ground we rent out, we've found a natural polymer compound that is awesome against fungal, bacterial, and viral infections, as well as nematodes, and we put out beneficial biology every chance we get. We're also in the process of changing from a nutrient replacement fertility model to more of the Albrecht theory of soil balancing.
I had previously read the article in No Till, and I've become a believer that glyphosate is doing as much harm as it is good. My holy ship moment reading the article was the part about high P soils, and the gly having nowhere to go. I cannot make no till work on most of the dryland I farm. One of the reasons is the Take-All that shows up in the wheat after about 3 years. Well, most of these soils are so high in P that my great grandkids won't have to worry about buying P. If anybody else has ever read any of Dr. Huber's work on the downside of glyphosate.....I'll just say I've become a believer.