Many space missions are searching for life beyond Earth, but are we prepared for the fallout if they succeed?

Microbes from space have fueled the plots of science fiction mainstays like "Project Hail Mary" and "The Andromeda Strain." But with more space missions launching each year, finding extraterrestrial life in a microbial form is becoming more plausible. What will the response be back here on Earth if—or when—scientists discover extraterrestrial microbes? Will the international policy and security communities be prepared for the fallout?