Laws, sausages, and misleading packaging

Laws are like sausages, it is better not to see them being made.
-- Otto von Bismarck

The connection between laws and sausages is clear, but what about sausages and false advertising? While I don't eat pork, I do eat chicken and occasionally buy (what I thought were) chicken sausages. While I try to examine food items (ingredients, manufacturers, etc.) I clearly missed a thorough reading of these. Of the three or four brands of chicken sausages I saw in an overpriced health-focused supermarket (you know what I'm talking about), all but one use a pork skin casing. This bothers me since I bought the chicken sausages to avoid pork and have assumed that others do the same. Additionally, since there is one brand that doesn't use pork, that tells me that it's possible.

See Al Fresco or Aidells (pick "Chicken and Apple") for some examples. I'll update this post later when I determine which brand is the "good" one.