Party Guests Won’t Talk After 9 Test Positive. Now They Face Subpoenas.
Rushing to contain a coronavirus cluster tied to a big party in a New York City suburb, officials turned to an unusual legal strategy

https://www.nytimes.com/2020/0...ronavirus-party.html

Party goers refused to talk to contact tracers, so NYC subpoena them.

Not an isolated incident and not limited to NY, I have read elsewhere that many people refuse to talk to contact tracers. This will delay or even reverse reopening for many places.