Genetically modified ("GM") plants have been modified to become their own "endotoxin factories". No microorganism (specifically, no B. thuringiensis) is involved in their self-production of the "Bt" endotoxin.
Read this article. And, specifically note this:
"The ["Bt toxin"] crystals are aggregates of a large protein (about 130-140 kDa) that is actually a protoxin - it must be activated before it has any effect. The crystal protein is highly insoluble in normal conditions, so it is entirely safe to humans, higher animals and most insects. However, it is solubilised in reducing conditions of high pH (above about pH 9.5) - the conditions commonly found in the mid-gut of lepidopteran larvae. For this reason, Bt is a highly specific insecticidal agent." (Emphasis added.)
FYI, pH 9.5 is a highly alkaline condition. In the human body, pH of over 7.45 is the dangerous imbalance called, "ALKALOSIS".
The presence of "detectable trace Bt toxin" in the human body in survivable pH conditions -- is totally insignificant.
Only an ignorant or duplicitious eco-wacko pushing an idiotic agenda would claim otherwise.