It is interesting that a study can be published in a peer-reviewed journal even though the title admits that the results may all be artefacts. It would not be hard to do a controlled study on this topic. There are groups of well-habituated chimpanzees where one could collect fecal samples after they have been observed to consume meat, and conversely there are well-studied wild gorillas that have never been observed to consume vertebrate prey. And to control for contamination of the fecal samples in the field, once could try amplifications from soil samples. Then it might be possible to actually say whether molecular analysis of primate diets using feces is useful or not, and perhaps even produce some believable results.
