Fascinating study, it looks like they really did their best to control all the variables.
Makes sense that dairy and eggs were the most commonly found non-vegan ingredients-- they are both such a huge part of cooking. As someone who has tried to go vegan in the past, I can tell you that cheese was probably the hardest thing to fully cut out for me, and eggs were right behind it. I'm glad the liars are being called out, though, that is some despicable behavior.