pls see me former post. POSH is PE-derived components which look like (MOSH) in the chromatogram.
Plastic is - for all migrating components like ink, mineral oil etc - a more or less effective barrier. Be even you are using minreal oil free ink for your products does not mean that all problems solved. The number of components used in packaging are hugh - you can create a new scandal every few week - beginning with ITX, 4-MBP and any other substance (not known yet) with a "X" in the name.
The former layer-based differentiation in primary, secondary or tertiery packaging doesn't help in future if you are looking from the food, because the substances in question should not be in the product end of shelf life. The pure definition as before does not help.
To change this thinking is a very hugh and cost intensive problem, because you have to included news papers, recyceled fibre industry and its collection strategy, the politics and their recycling quote, foreign countries, in many cases Third World or developin countries etc etc etc.
For me this means: Create a Safe for your product and avoid, what's possible, because you don't know, what's coming tomorrow. But then your are in the cost discussion - a scissor between sales, margins, prevention and risk minimization etc.etc.
That means: All this will not happen in near future, but I think within the next ten years the world will have changed in this topic.
I am not a packaging specialist, but I am sure this will become a broader topic like e.g. microbiology, allergens etc., in which more than packaging specialist has to be included.