(b) In a case tried according to civil law, it seems that the whole controversy is today very often of little practical importance; for court decisions are now frequently left to jurymen, and these men must either have no private certainty before they are admitted to their office (as is the case in the United States), or they have the obligation of using private knowledge in casting their vote and of communicating it to fellow-jurors during the deliberations (as is the case in some other countries). Hence, the moral question whether it is lawful to decide according to private knowledge against the public evidence largely disappears. But when a case of the kind now considered does occur, the position of the civil law also agrees, it seems, with that of St. Thomas: “Neither the judge nor the jury can consider a private fact of which they have a merely personal knowledge, however important may be its bearing on the issue, unless it has been brought to their attention by evidence properly produced in open court” (Robinson, Elementary Law, Sec. 334). But the lightest penalty allowed by the law should be imposed in such a case. If a judge were privately certain that a jury verdict was unjust, he could offer his own testimony or appeal to the pardoning power.
1954. The principle that a judge must be guided only by his public knowledge applies also to other officials who are required to follow the results of a public investigation, but not to those who are required to act according to their best knowledge, whether public or private.
(a) Thus, public knowledge must be the guide of those who are ministers of a court and on whom it falls to execute its decrees; for they are the instruments and subjects of the president of the court. If they have private information of a material and relevant kind, they should disclose it as witnesses.
(b) Private knowledge that is opposed to and more reliable than public knowledge must be the guide of those who are supposed to act according to the most trustworthy knowledge they have. Hence, a superior who has the power to make appointments to office should disregard the votes of his advisors, if he can prove that they are wrong in their opinions about a nominee for office. He may confirm or annul their choice according to his honest conscience.
1955. When Guilt Is Doubtful in Criminal Cases.—In a criminal case or a case in which punishment is inflicted, if the guilt of the accused is doubtful, the sentence should be for acquittal; for no one should be condemned unless his guilt is morally certain (see 1728 sqq.).
(a) Thus, according to Canon Law, an ecclesiastical judge who is not certain that sentence for the plaintiff will be just, must declare that the latter has not established his case and must dismiss the defendant, though exception is made for cases that have the favor of law (such as marriage, liberty, testaments, Canon 1869, n. 4). Canon Law places the burden of proof on him who makes an assertion, and it rules that the defendant is to be acquitted if the plaintiff or accuser fails to prove, even though the person on trial says nothing (Canon 1748).
(b) According to the civil law the rules on evidence also favor the accused in cases of doubt. He must not be held guilty unless the State has proved affirmatively and beyond reasonable doubt every material allegation in the indictment. In capital cases the evidence of guilt must be equivalent in weight and conclusiveness to the direct testimony of two competent and reliable witnesses. A reasonable doubt in the mind of a juryman is one for which he can give himself an adequate and satisfactory reason (Robinson, Elementary Law, Sec. 608).
1956. Doubt in Civil Cases.—In civil cases, if it is uncertain after the investigation for whom the decision should be given, the following rules seem to be just:
(a) if the parties are unequal in claim, the decision should be for the one whose claim is more weighty; for the judge is appointed by society to investigate the truth of a controversy and to decide according to the merits of the case. Thus, decision should be for the party Whose arguments are of at least equal strength—but who has legitimate possession (for “possession is nine points in law”), or whose case enjoys the favor of the law (e.g., in Canon Law, the cases of widows, wards, minors), or for the party whose case is stronger and more probable. Innocent XI condemned the proposition that a judge may decide for the side whose arguments are less probable (Denzinger, n. 1152);
(b) if the parties are equal in their claims, some think that property in dispute should be equally divided between the contestants, others that the parties should be persuaded to compromise, or, if this is impossible, that the decision may be given for either one of them. But if positive law regulates the manner of proceeding in such a case, its provisions should be followed. Thus, in Canon Law, if a judge is in doubt as to which one of two competitors has possession, he may grant it to both of them indivisibly, or he may command them to deposit it with a sequester, pending the settlement of the dispute (Canon 1697).