If you are interested - check this out and watch the two two-part videos titled:
W-FIVE: Safe to Eat? part one 11:18
W-FIVE: Safe to Eat? part two 10:20
http://www.ctv.ca/servlet/ArticleNews/story/CTVNews/20071025/WFIVE_chinafood_071027/20071027?hub=WFive