Very possible. The factory just gets as many tarps done as they can without regard to process or the procedures.
I will say in relation to the steady rain my ridge line was soaked (the actual cord). I did not have drip lines. My son's was not and he did have ridge lines. Anyway it did rain enough that is the rope was was saturated and I still did not get water on me even when I awoke in the middle of the night when a heavy down pour happned. I think it woke up every one between the thunder and the sudden change from steady rain to pound pound pound.