M&M's

Here is my question of the day: Why is there no "seam" on M&M's? How do they get that perfect coat around the tiny circles of chocolate deliciousness? I have been thinking about this all day and it is boggling my mind. Someone of the radio the other day said it's because they are dropped through the candy shell coating and then dries before it hits the next conveyor belt. I thought that was a pretty good idea, but I highly doubt that that is right - and he admitted that he really had no idea. I really have no idea either and it's bothering me...so if anyone else has any thoughts on this please feel free to share.