what does a USCIS document DS2019 state??

Answer 1

DS2019 (Formerly IAP-66), now a State Department Certificate issued by sponsoring institutions such as Stanford under DoS approval. Can be used by students and postdoctoral scholars for a relatively wide variety of activities, although sponsors usually are authorized for only a few. Students are allowed to remain as long as is needed to finish a degree program, but scholars and professors may remain only three years