Amy Radil/KUOW As Watkins made the rounds in Maple Leaf, a residential neighborhood of Seattle, earlier this month, he appeared disheartened to find an entire red velvet cake in someone's trash bin. Any household with more than 10 percent food in its garbage earns a bright red tag notifying it of the infraction. 'Right now, I'm tagging probably every fifth can,' Watkins says. 'I don't know if that's just the holidays, or the fact that I'm actually paying a lot more attention.' Watkins doesn't have to comb through the trash — the forbidden items are plain to see.