This chapter examines state and federal laws in the United States that govern legal and ethical issues concerning genetic and genomic analysis for diagnostic purposes; regulation of genetic testing, genetic discrimination, and privacy; and clinical applications of genomics. At the state level, legislatures have enacted laws in various areas, including newborn screening and nondiscrimination and privacy protections. In addition, state courts have addressed some issues concerning genetics, such as the duty to warn. At the federal level, the US Congress has enacted a specific statute, the Genetic Information and Nondiscrimination Act, which protects genetic information. Other federal statutes, which do not address genetics or genomics in particular, also have relevance in the genetics context, including laws that protect against certain forms of discrimination or that regulate laboratories. Federal agencies also play a role, for example, in protecting genetic privacy or regulating genetic tests. Finally, the US Constitution is relevant to genomics, especially concerning reproductive rights, which are pertinent to reproductive genetic testing.