If exposed to an infected individual, employees should isolate or quarantine. After 5 days, they should get tested.
Viral tests (i.e. NAAT’s and antigen tests) detect current COVID-19 infection.
According to the CDC, the American Disabilities Act (ADA) states that mandatory employee testing must be “job related and consistent with business necessity.” The EEOC (Equal Employment Opportunity Commission) confirms that employers can use an “accurate and reliable test” to see if an employee has COVID-19. This is permitted as a condition to enter the workplace if they potentially “pose a direct threat to the health of others.