As another example of probably fine GMO, I've just come across a review highlighting the urgency of engineering microbes able to assimilate lactose (to use whey and other wastes of dairy industry as substrates for exopolysaccharide synthesis). They also argue for creating (more) efficient EPS-producers culturable on cellulose-containing wastes, although that does seem to me rather more dangerous, on technical glycerole after biodiesel production, etc.
Basically: How does one pursue the truth when direct engagement with evidence is infeasible?
I came to this question while discussing GMO labeling. In this case I am obviously not in a position to experiment for myself, but furthermore: I do not have the time to build up the bank of background understanding to engage vigorously with the study results themselves. I can look at them with a decent secondary education's understanding of experimental method, genetics, and biology, but that is the extent of it.
In this situation I usually find myself reduced to weighing the proclamations of authorities: