[toolz]

I wouldn't be surprised if that's misleading considering the other article was suggesting nitrite precursors are usually what's in the food later to be turned into nitrite, but I'd love to be wrong.

You could simply measure the levels of nitrite before any exists and the end product might still have just as much.

[maxerickson]

The one article is talking about celery juice being stealth nitrates. It's not something that is in the pork itself.

The only candidate would be natural flavors, and I sort of doubt that they would get away with that.