Listeria in Focus, Part 3: Is zero tolerance fair?

Compared to policies in other countries, the US has draconian regulations on listeria. Some salmon smokers say completely removing the bacterium is near-impossible. Should the rules be changed?

Smoked salmon - magicattic88/flickr
Smoked salmon - magicattic88/flickr
Published 21 October 2015, 13:11Updated 9 May 2016, 19:08