Anyone know chemistry? I'm lost!!

[Pippa_the_Prius]

  Good Morning friends 
I've been interested in the EPA's developments on regulations for "forever chemicals" or PFAS. I wrote a little paper one it just to try and wrap my head around it but I'm still so lost on if fluorinated carbon atoms are a sure-fire tell of a PFAS or if it's two or more in a chain.

Has anyone else learned about these? Here's my paper I wrote to try and understand, it's cited appropriately.

I always worry about chemicals in our food! But there's only so much you can do.

-NOTE-

I've also learned that the main pesticide breaks down into PFAS so there's that!