Prima facie evidence is a legal term used to mean that you have enough evidence to prove something by pointing to some basic facts, but that your proof can be refuted.(noun)
An example of prima facie evidence in a case about whether a test was discriminatory would be evidence that minorities all performed significantly worse on the test than whites.
See prima facie evidence in Webster's New World College Dictionary
Origin: see prima facie
See prima facie evidence in American Heritage Dictionary 4