There was a catch-22 in favor of illegal immigrants regarding falsification of tax and ID documents.
Basically it was wrong to submit false docs, but not a chargeable offense as the law did not specify it as chargeable.
States attempted to charge and enforce and using this infraction as proof the illegal forged documents, but the law had a catch-22 preventing such.
SCOTUS deliberated on how to apply the circular Law logic and (in March) ruled it how to read the law in a way to charge individuals with forgery and falsification.
The dissenting votes had to do with the reasonable expectation of privacy and the 5th amendment for the core tax document (w-4?) being eligible as proof.
There was a catch-22 in favor of illegal immigrants regarding falsification of tax and ID documents.