Overruling Banner Estrella Medical Center, 362 NLRB 1108 (2015), the National Labor Relations Board (NLRB) has held that investigative confi­dentiality rules are lawful Category 1 rules under The Boeing Company, 365 NLRB No. 154 (2017), where by their terms the rules apply for the duration of any investi­gation. Apogee Retail LLC d/b/a Unique Thrift