PORTER, Justice (on reassignment).
Defendant was tried by jury upon two counts of third degree burglary, allegedly committed in rural Yankton County on November 12, 1975. A witness for the State, one Friesen, testified that he committed the burglaries, and also implicated defendant. No witness, other than Friesen, gave any testimony directly tending to show defendant’s complicity. Essentially upon Friesen’s testimony, defendant was convicted as charged.
Defendant appeals, contending that the trial court erred (1) in failing to instruct the jury that the testimony of Friesen should be examined with great care and caution before accepting it as true, and (2) that [590]*590failure to so instruct constituted prejudicial error.
DUTY OF COURT TO INSTRUCT
By his own testimony, Friesen was an accomplice.1 The State does not argue otherwise. Defendant tendered an instruction upon the weight to be given Friesen’s testimony, which the court refused.2 In State v. Douglas, 70 S.D. 203, 225, 16 N.W.2d 489, 499-500 (1944), “where the testimony of the accomplice [was] necessary to establish facts essential to defendant’s guilt” this court (per Bakewell, J.) held that the defendant’s requested instruction “as to the duty of the jury to examine [the accomplice’s] testimony with great care and caution before accepting it as true” should have been given. Referring to Douglas, the State’s brief concedes: “[The] case appears to hold that a cautionary instruction should be given warning that an accomplice’s testimony should be examined ‘with great care and caution.’ The state does not contest the holding of [the] case, * * We conclude that Douglas may fairly be viewed as precedent for holding in this case that the trial court should have given the requested cautionary instruction as to the testimony of Friesen.3
There are sound reasons for the giving of a cautionary instruction. They are stated in People v. Tewksbury, 15 Cal.3d 953, 967, 127 Cal.Rptr. 135, 145-46, 544 P.2d 1335, 1345-46 (1976):
“[Experience has shown that the evidence of an accomplice should be viewed with care, caution and suspicion because it comes from a tainted source and is often given in the hope or expectation of leniency or immunity.” [citations omitted.] In addition to being derived from a suspect source accomplice testimony is frequently cloaked with a plausibility which may interfere with the jury’s ability to evaluate its credibility. “ ‘[A]n accomplice is not merely a witness with a possible motive to tell lies about an innocent accused but is such a witness peculiarly equipped, by reason of his inside knowledge of the crime, to convince the unwary that his lies are the truth.’ ” (Heydon, The Corroboration of Accomplices, 1973 Crim.L.Rev. (Eng.Ed.) 264, 266; see also Note, 54 Colum.L.Rev. 219, 234.)
It has been said that a skeptical approach to accomplice testimony is a mark of the fair administration of justice. People v. McCoy, 392 Mich. 231, 220 N.W.2d 456 (1974).4
[591]*591We recognize that the court, by Instruction No. 10 (South Dakota Criminal Pattern Jury Instruction 1-16-6) properly instructed the jury that the testimony of the accomplice must be corroborated. SDCL 23-44-10.5 However, under our holding in Douglas, although the accomplice corroboration instruction applying SDCL 23-44-10 (then SDC 34.3636) is given, the cautionary instruction concerning the weight to be given the testimony of the accomplice is also to be given, if requested. We conclude, in the case at bar, that the failure of the trial court to give the requested cautionary instruction was error.
HARMLESS OR PREJUDICIAL ERROR
I
In addition to Friesen, the State’s case included the testimony of seven witnesses. Taken as true, the testimony of the seven would not make a case for the jury on the charges against the defendant, and the State does not contend that it would. It may fairly be said that the conviction was substantially procured by the testimony of Friesen.
The court gave the jury Instruction No. 13 concerning witness credibility.6 This instruction applied equally to all witnesses. This was misdirection since it had the erroneous effect of telling the jury that the credibility of an accomplice was to be determined by the same test as would be applied in determining the credibility of any other witness. State v. Hale, 231 N.C. 412, 57 S.E.2d 322 (1950); Miller v. State, 508 P.2d 1207 (Wyo.1973); Annot., 4 A.L.R.3d 351-56 (1965). “The jury is to be admonished so that it will not accept the words of an accomplice at face value, with any presumption of truthfulness and candor, or upon the same standard as that applied to other witnesses.” People v. Gordon, 10 Cal.3d 460, 471, 110 Cal.Rptr. 906, 912-13, 516 P.2d 298, 304 (1973).
The giving of Instruction No. 13 in this case compounded rather than cured the error occasioned by the failure of the court to give a cautionary instruction referring specifically to the weight to be given accomplice testimony.
II
The failure to give the accomplice cautionary instruction was harmless error, the State argues, because the motivation of Friesen to lie was fully disclosed to the jury during his direct and cross-examination. Among other things, Friesen’s testimony revealed that he was granted immunity, not only as to the two burglaries of November 12, 1975, but also as to any crime he had committed in South Dakota since he was eighteen years of age — a period of eight years. On cross-examination Friesen testified:
Q. So that from the [agreement] that you made with the officers, it was necessary for you to give them information whereby they could arrest someone else for you to comply with your part of the agreement as to immunity, was it not?
[592]*592A. Yes.
The argument of the State here was advanced in Anthony v. State, 521 P.2d 486, 491 (Alaska 1974), where the State sought “to avoid the impact of the concededly applicable rule by arguing that the cross-examination of [the accomplice] and defense counsel’s closing argument sufficiently apprised the jury of the lack of reliability of accomplice testimony, [footnote omitted] so that the failure of the court to give the accomplice instruction was harmless.” After expressing doubt that the cross-examination answers had the effect claimed, the court went on to say:
But even supposing cross-examination and closing argument to have been devastating, the purpose of the rule is to raise the issue of accomplice credibility above mere adversary colloquy.
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PORTER, Justice (on reassignment).
Defendant was tried by jury upon two counts of third degree burglary, allegedly committed in rural Yankton County on November 12, 1975. A witness for the State, one Friesen, testified that he committed the burglaries, and also implicated defendant. No witness, other than Friesen, gave any testimony directly tending to show defendant’s complicity. Essentially upon Friesen’s testimony, defendant was convicted as charged.
Defendant appeals, contending that the trial court erred (1) in failing to instruct the jury that the testimony of Friesen should be examined with great care and caution before accepting it as true, and (2) that [590]*590failure to so instruct constituted prejudicial error.
DUTY OF COURT TO INSTRUCT
By his own testimony, Friesen was an accomplice.1 The State does not argue otherwise. Defendant tendered an instruction upon the weight to be given Friesen’s testimony, which the court refused.2 In State v. Douglas, 70 S.D. 203, 225, 16 N.W.2d 489, 499-500 (1944), “where the testimony of the accomplice [was] necessary to establish facts essential to defendant’s guilt” this court (per Bakewell, J.) held that the defendant’s requested instruction “as to the duty of the jury to examine [the accomplice’s] testimony with great care and caution before accepting it as true” should have been given. Referring to Douglas, the State’s brief concedes: “[The] case appears to hold that a cautionary instruction should be given warning that an accomplice’s testimony should be examined ‘with great care and caution.’ The state does not contest the holding of [the] case, * * We conclude that Douglas may fairly be viewed as precedent for holding in this case that the trial court should have given the requested cautionary instruction as to the testimony of Friesen.3
There are sound reasons for the giving of a cautionary instruction. They are stated in People v. Tewksbury, 15 Cal.3d 953, 967, 127 Cal.Rptr. 135, 145-46, 544 P.2d 1335, 1345-46 (1976):
“[Experience has shown that the evidence of an accomplice should be viewed with care, caution and suspicion because it comes from a tainted source and is often given in the hope or expectation of leniency or immunity.” [citations omitted.] In addition to being derived from a suspect source accomplice testimony is frequently cloaked with a plausibility which may interfere with the jury’s ability to evaluate its credibility. “ ‘[A]n accomplice is not merely a witness with a possible motive to tell lies about an innocent accused but is such a witness peculiarly equipped, by reason of his inside knowledge of the crime, to convince the unwary that his lies are the truth.’ ” (Heydon, The Corroboration of Accomplices, 1973 Crim.L.Rev. (Eng.Ed.) 264, 266; see also Note, 54 Colum.L.Rev. 219, 234.)
It has been said that a skeptical approach to accomplice testimony is a mark of the fair administration of justice. People v. McCoy, 392 Mich. 231, 220 N.W.2d 456 (1974).4
[591]*591We recognize that the court, by Instruction No. 10 (South Dakota Criminal Pattern Jury Instruction 1-16-6) properly instructed the jury that the testimony of the accomplice must be corroborated. SDCL 23-44-10.5 However, under our holding in Douglas, although the accomplice corroboration instruction applying SDCL 23-44-10 (then SDC 34.3636) is given, the cautionary instruction concerning the weight to be given the testimony of the accomplice is also to be given, if requested. We conclude, in the case at bar, that the failure of the trial court to give the requested cautionary instruction was error.
HARMLESS OR PREJUDICIAL ERROR
I
In addition to Friesen, the State’s case included the testimony of seven witnesses. Taken as true, the testimony of the seven would not make a case for the jury on the charges against the defendant, and the State does not contend that it would. It may fairly be said that the conviction was substantially procured by the testimony of Friesen.
The court gave the jury Instruction No. 13 concerning witness credibility.6 This instruction applied equally to all witnesses. This was misdirection since it had the erroneous effect of telling the jury that the credibility of an accomplice was to be determined by the same test as would be applied in determining the credibility of any other witness. State v. Hale, 231 N.C. 412, 57 S.E.2d 322 (1950); Miller v. State, 508 P.2d 1207 (Wyo.1973); Annot., 4 A.L.R.3d 351-56 (1965). “The jury is to be admonished so that it will not accept the words of an accomplice at face value, with any presumption of truthfulness and candor, or upon the same standard as that applied to other witnesses.” People v. Gordon, 10 Cal.3d 460, 471, 110 Cal.Rptr. 906, 912-13, 516 P.2d 298, 304 (1973).
The giving of Instruction No. 13 in this case compounded rather than cured the error occasioned by the failure of the court to give a cautionary instruction referring specifically to the weight to be given accomplice testimony.
II
The failure to give the accomplice cautionary instruction was harmless error, the State argues, because the motivation of Friesen to lie was fully disclosed to the jury during his direct and cross-examination. Among other things, Friesen’s testimony revealed that he was granted immunity, not only as to the two burglaries of November 12, 1975, but also as to any crime he had committed in South Dakota since he was eighteen years of age — a period of eight years. On cross-examination Friesen testified:
Q. So that from the [agreement] that you made with the officers, it was necessary for you to give them information whereby they could arrest someone else for you to comply with your part of the agreement as to immunity, was it not?
[592]*592A. Yes.
The argument of the State here was advanced in Anthony v. State, 521 P.2d 486, 491 (Alaska 1974), where the State sought “to avoid the impact of the concededly applicable rule by arguing that the cross-examination of [the accomplice] and defense counsel’s closing argument sufficiently apprised the jury of the lack of reliability of accomplice testimony, [footnote omitted] so that the failure of the court to give the accomplice instruction was harmless.” After expressing doubt that the cross-examination answers had the effect claimed, the court went on to say:
But even supposing cross-examination and closing argument to have been devastating, the purpose of the rule is to raise the issue of accomplice credibility above mere adversary colloquy. The giving of the instruction to view the testimony of an accomplice with distrust clothes the issue with the cloak of the judge’s impartial authority and thus mandates application of that criterion in the jury’s deliberation. For this reason alone, the failure to give the accomplice instruction cannot be regarded as harmless under the circumstances of this case.
Here, the State’s case turned upon Fries-en’s credibility. The jury had to credit his testimony in order to convict defendant. The jury should have had the benefit of the accomplice cautionary instruction in order to enable them to properly evaluate that testimony. As an accomplice, Friesen, in law, is regarded as a corrupt source of testimony. “The jurors must be warned that, in effect, the accomplice may tailor the truth to his or her own self-serving mold, and that they are to weigh the testimony with that caveat in mind.” People v. Gordon, 10 Cal.3d 460, 471, 110 Cal.Rptr. 906, 913, 516 P.2d 298, 305 (1973).
Because the weight given the Friesen testimony by the jury was of crucial importance to the outcome, failure to correctly instruct the jury on the weight to be given accomplice testimony went to the core of the case, and was patently prejudicial to defendant.7
Ill
The State contends that the failure to give the proposed instruction, “while constituting error, is not such a grievous error that reversal is mandated.” It concedes that the giving of the instruction proposed by the defendant is the better course of conduct, but argues that any error committed was harmless, referring to SDCL 23-1-2 for support. SDCL 23-1-2 provides that an error or mistake in any proceeding does not render it invalid, unless it has actually prejudiced the defendant or tended to his prejudice, in respect to a substantial right. In State v. Reddington, 80 S.D. 390, 396, 125 N.W.2d 58, 62 (1964), this court defined prejudicial error as “ ‘such error as in all probability must have produced some effect upon the final result of the trial, namely, the verdict of the jury.’ Prejudicial error is error which affects the final result and is harmful to the substantial rights of the party assigning it.” For the reasons given in this opinion, supra, we conclude that the failure to give the requested instruction in all probability must have produced some effect upon the jury verdict. The error was, therefore, prejudicial to the rights of the defendant.
Because of our holding, we do not reach the other issue raised by defendant on this appeal.
CONCLUSION
1. The judgment from which defendant appeals is reversed.
2. For cases tried after the publication of this opinion, it will be deemed error to fail upon request to give a cautionary instruction concerning accomplice testimony [593]*593whenever the testimony given upon the trial is sufficient to warrant the conclusion upon the part of the jury that a witness implicating a defendant was an accomplice, provided the witness was not called by the defendant requesting the instruction.
ZASTROW and MORGAN, JJ., concur.
DUNN, C. J. and WOLLMAN, J., dissent.