The Fifth Amendment is part of the U.S. Constitution's Bill of Rights and protects against self-incrimination. This principle is rooted in 17th-century English common law and ensures people aren't forced to testify against themselves in criminal cases. It's a well-known concept in the U.S., referenced in TV legal dramas and real-life cases. The amendment is crucial for maintaining the presumption of innocence, requiring prosecutors to prove guilt. Originally for federal cases, it now applies to state and civil cases, too. In criminal trials, jurors can't assume silence means guilt, but civil cases may allow negative inferences. Dr. Anthony Fauci invoked the Fifth on Wednesday at a Republican-led Senate committee hearing about the COVID-19 pandemic.