Visa Screen for Green Card Holders?Really?

Hello everyone,
Do you guys know if the Type I is actually needed for those who already have a Green Card? Massachusetts requires type I, but it doesn't take into account that there are applicants who are already permanent residents in the USA.. It's somehow confusing.
My questions are: If I am eligible for license with MA, can I take NPTE or do i need to be eligible for the type I certificate (visa screen, which I don't need)?
This is so confusing:)!
Hope some of you who are/were in the same shoe can share their experiences.
Thanks