really lowers my opinion of the studies they conduct at Penn State.
You do realize it was tongue in cheek, right? They're joking around. Mouse DNA showed up in the test results, because mice had visited the carcasses after the deer had died, and chewed on various things. i.e. The deer itself, the tracking devices, collars, etc. The mice never killed a single deer, and no one from PSU, or the PGC thinks/thought they did, even for a second.