Zipped and/or locked

I am eating leftover spaghetti, fresh from the office microwave. The container, a flimsy Ziploc® product, is sweating onto my desk. I can already feel the terrible toxic by-product of plastic and heat as it is absorbed by my prostate. Or is that simply the paranoid workings of my brain talking to me? I investigate, and find the following communique:

When used in the microwave, there is no trace level migration of dioxins from any Saran™ or Ziploc ® product. We know this because these products are 100% dioxin-free…Our Saran™ and Ziploc ® products can be used with confidence when label directions are followed…Please help us alleviate consumers’ concerns and share these facts. Thank you for giving us a chance to set the record straight.

This, from the company’s own mouth organ. Now I don’t know what to believe. My pessimistic obsessive hypervigilance vs. their rosy corporate communication. How can we both be wrong?