Of the several modes of assailing the credibility of a witness, the one most usually resorted to, is a cross-examination as to his relationship to the parties, his interest in the pending suit, his hostility to the prisoner, if it be a prosecution for a criminal offense, his motives, and whatever may fairly be presumed to bias him in favor of the party at whose instance he is testifying, and against the adverse party. These are matters collateral to the main issue of facts which is to be determined; and while the general rule is, that the answers of a witness -to collateral questions cannot be contradicted by the party cross-examining, an exception obtains in reference to questions of this character, which are directed, not against his general credit, but against his credit, and capacity to testify accurately in the particular case. — 1 Whart. Law of Ev. §545; McHugh v. State, 31 Ala. 317; Bullard v. Lambert, 40 Ala. 204; 1 Green Ev. § 450; Blakey v. Blakey, 33 Ala. 611. The circumstances which affect the particular credit of the witness, are generally incapable of proof save by his acts or declarations, and it is but just that the witness should have his attention directed to them, and whatever explanation can be given of them without entering into particulars, should be received. — 4 Phill. Ev. (2 0. & H. Notes) 717. If the witness should deny the relationship or bias, it may be proved by other evidence. Declarations in the presence of third persons, indicative of hostility, may be called to the attention of the witness, and he may be required to admit or deny them ; if he deny them the persons hearing them, to whom the attention of the witness is directed, may be called to contradict him. How far the bias of the witness, from whatever cause it arises, affects his credibility, is a question for the consideration of the jury, and depends upon his manner of testifying before them, the
2. Mrs. Spencer was not an incompetent witness; nor was there any objection to her testifying to facts which repelled all suspicion of her husband’s’ guilt of the murder, with which ,he had at one time been charged. Husband or wife are not parties to the record, and have no interest directly involved in the prosecution. The judgment of conviction or acquittal, could not become evidence for or against the one or the other, except so far as it would be evidence for or against other strangers to it. — 1 Green.-Ev. §§ 241-342; 1 Phill. Ev. 71-72; Powell v State, MSS.
3. The general rule in regard to the relevancy of testimony, is, that the facts and circumstances which, when proved, are incapable of affording any reasonable presumption or inference, in reference to a material fact or inquiry involved in the issue, cannot be given in evidence.— Governor v. Campbell, 17 Ala. 566; Camphell v. State, 23 Ala. 44. In practice, the application of the ^ules presents most embarrassing questions, and it is often a matter of serious difficulty to determine whether a particular fact or circumstance is not too remote to aid the jury in arriving at a conclusion upon the principal fact to be proved, and its introduction would not confuse and mislead, directing their attention from the real issue. The only tendency of the evidence sought to be elicited from Mrs. Demorest, was the contradiction of
4. The suppression of evidence by a prisoner or prosecutor, is a material circumstance to be considered by the jury. But we cannot perceive that the principle has any application to the present case. There was no ground on which an inference could be rested that the pieces of paper, referred to in the charge requested • by. the prisoner, would have shed any light on the inquiry as to his guilt or innocence — none for supposing that they had been preserved, or were in possession of the prosecutor at the time of the trial, and were improperly withheld by him. There must be evidence in the possession of the prosecutor which he withholds, and material evidence, before a charge of this kind should be given.
For the error we have pointed out, the judgment is reversed and the cause remanded. The prisoner will remain in custody until discharged by due course of law.