Employers are within their rights to require employees and new hires to take a test to see if they are currently infected with COVID before they allow them to enter the workplace. However, what federal statute may prohibit and employer from requiring employees and new hires to take a test for antibodies to see if someone has ever had COVID$-19?$

Americans With Civil Disabilities Act.

Fair Debt Collection Practices Act

Title VII of the Civil Rights Act of $1964$

CDC guidelines.