Other Uses and References
The phrase prima facie is sometimes misspelled prima facia in the mistaken belief that facia is the actual Latin word; however, the word is in fact faciēs (fifth declension), of which faciē is the ablative.
The phrase is very commonly used in academic philosophy, in exactly the same sense used by lawyers. Among its most notable uses is in the theory of ethics first proposed by W. D. Ross, often called the Ethic of Prima Facie Duties, as well as in epistemology, as used, for example, by Robert Audi. It is generally used in reference to an obligation. "I have a prima facie obligation to keep my promise and meet my friend" means that I am under an obligation, but this may yield to a more pressing duty. A more modern usage prefers the title pro tanto obligation: an obligation that may be later overruled by another more pressing one; it exists only pro tempore.
In policy debate theory, prima facie is used to describe the mandates or planks of an affirmative case (or, in some rare cases, a negative counterplan). When the negative team appeals to prima facie, it appeals to the fact that the affirmative team cannot add or amend anything in its plan after being stated in the first affirmative constructive.
A common usage of the phrase is the concept of a "prima facie speed limit", which has been used in Australia and the United States. A prima facie speed limit is a default speed limit that applies when no other specific speed limit is posted, and which may be exceeded by a driver. However, if the driver is detected and cited by police for exceeding the limit, the onus of proof is on the driver to show that the speed at which the driver was travelling was safe under the circumstances. In most jurisdictions, this type of speed limit has been replaced by absolute speed limits.
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