In the regime of Anglo-American tort law, every person has a responsibility to comport him- or herself with “due care” in going about day-to-day activities so as not to imperil the health, safety, or general welfare of others. The gold standard for determining what constitutes due care in any particular situation is what a reasonable person, similarly situated, would do. Determinations of due care are necessarily fact specific. Nevertheless, the general objective is to strike an appropriate balance between an unrealistically high standard of caution and one that fails to take into account the known or foreseeable risks of any human endeavor. The same standard applies to individuals regardless of their age (so long as they have reached majority), gender, race, and level of education or economic status. The standard also applies to fictional “persons” such as corporations. The usual or prevailing custom and practice in an industry or occupation may provide relevant evidence of what constitutes “due care” in the activities common to it, but that evidence can be effectively overcome or rebutted by competent, credible evidence that the custom and practice either diverges from what it has been asserted to be or that the custom and practice is itself unsafe or otherwise poses an unreasonable risk of harm to others. Until quite recently, a singular exception to this general principle of tort law was made for the medical profession. We will consider this exception in the next section.