Northern Brewer has a product called Fast Pitch Canned Wort. The instructions say that you can just mix it with water out of the tap and then pitch yeast to make a yeast starter.
Why does this not requiring any boiling? Presumably the canned wort itself is sterile, but what about the water that is added, and what about the outside of the container? In a video, a Northern Brewer employee just opens the can with his grubby hands, adds water and pitches yeast into it.
Why is this not a recipe for a an infected starter?