No, you can’t require confirmatory testing.
Explanation: Your authority as an employer goes only so far as the current public health guidelines allow. Keep in mind that undergoing COVID testing is typically not just inconvenient but also uncomfortable since the most common form of testing, RT-PCR, is done on throat samples extracted with a big swab through the patient’s nose. You can, of course, always recommend that a recovered worker get tested but can’t bar his/her return to work if he/she refuses. Now if the guidelines change and call for confirmatory testing, you’re back on solid ground in requiring a negative before a return. But you can’t go that far today. Hope that helps and sorry for the delay in responding. Glenn