From the Document: "Contact tracing is a classic tool of public health investigation used to identify the close contacts of persons infected with a communicable disease, notify them of potential exposure, and enable control measures such as quarantining exposed persons. Contact tracing programs are generally subject to state, territorial, tribal, and local laws and policies. The U.S. Centers for Disease Control and Prevention (CDC) assists jurisdictions' programs by providing guidance, technical assistance, and funding. Several public health experts affiliated with universities (e.g.,Johns Hopkins University), policy research organizations (e.g., American Enterprise Institute), and state associations (e.g., National Governors Association) have posited that contact tracing (combined with adequate diagnostic testing) could help prevent surges in infections, particularly when case counts are low. Contact tracing to control Coronavirus Disease 2019 (COVID-19) has been used with arguable success in countries such as South Korea, Taiwan, Iceland, and New Zealand--many attribute their relatively low reported case counts, in part, to successful contact tracing. However, several experts assert that a successful contact tracing effort in the United States would require additional workforce and possibly the use of new technologies by jurisdictions."
CRS In Focus, IF11609
Congressional Research Service: https://crsreports.congress.gov/