Employers ask on application for if you receive(d) SNAP, Temporary Assistance, or SSI

[Kebap]

Isnt it illegal for employers to ask such a question?

Does anyone know of any accuracy on this?

Depends on where you live, which laws govern your life.

For example in Germany, you are legally allowed to lie to your employer if she asks you about being pregnant and related issues. It's just none of their business. Then again, mosbunal people don't know their law very well and might just be intimidated into answering truthfully nonetheless.