Independent of the Biden Administration's private-employer COVID-19 vaccine-or-test mandate, many employers either have adopted or plan to adopt their own mandatory vaccine policies to reduce the spread of COVID-19 in the workplace. While some employers suspended their mandatory COVID-19 vaccine policies and plans after the U.S. Supreme Court blocked the administration's private-employer mandate, others are considering whether to keep their policies and plans in place. The absence of a federal mandate provides private employers the flexibility to tailor their vaccination policies to their own workplace-specific challenges and determine how they should be enforced.