USCIS NEWS: https://www.uscis.gov/news/alerts/uscis-begin-implementing-new-policy-memorandum-notices-appear
PM-602-0050.1备忘录:
https://www.uscis.gov/sites/default/files/USCIS/Laws/Memoranda/2018/2018-06-28-PM-602-0050.1-Guidance-for-Referral-of-Cases-and-Issuance-of-NTA.pdf