In February, Health and Human Services Secretary Alex Azar invoked the Public Readiness and Emergency Preparedness Act. The 2005 law empowers the HHS secretary to provide legal protection to companies making or distributing critical medical supplies, such as vaccines and treatments unless there’s “willful misconduct” by the company. The protection lasts until 2024. That means that for the next four years, these companies “cannot be sued for money damages in court” over injuries related to the administration or use of products to treat or protect against Covid.

Here is a mainstream news article explaining the act.

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