There is a link that has been drawn. There isn't as much data as perhaps there might be, simply because a lot of it is covered up. I will admit to a data gap there, but a link has been drawn with enough credible information to say that it's an important factor. We're also protecting the animals themselves here, too, and these are practices that we simply don't want to have.
On January 31st, 2019. See this statement in context.