Further analysis revealed that among the samples in the test, not only were there the expected black poopons and white poopons, but a third and rarer bacterium with some characteristics of each. This third sort of contaminant has a tighter structure that enables it to pass through the thinner plastic bags that some dog owners use — the bag that protects the Sunday New York Times, for instance, or fresh produce bags, especially the semi-porous green bags often used at up-market organic grocers.
Moral of the story: Use Teflon.
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