In People v. Smith (2017) 12 Cal. App. 5th 766, 778-80 the judge instructed the jury per the standard CALCRIM instructions that accomplice testimony requires corroboration before the jury may accept it as true. The appellate Court criticized these instructions because they failed to explain that the supporting evidence requirements applies “only when [the accomplice] testimony is being used to determine a fact used to convict a defendant.” (Id. at 780.) Furthermore, CC 301 was erroneous because “it instructed the jury that … all of Mitchell’s testimony, including the exculpatory testimony pertaining to Smith, required corroborating evidence before the jury could accept it as true.” (Id. at 780.) In other words, CC 301 “improperly informed the jury that there must be corroborating evidence to support an accomplice’s testimony that is either neutral or exonerating.” (Ibid.)
The CALCRIM committee modified CC 334 in response to Smith by limiting the corroboration requirement to a statement or testimony “that tends to incriminate the defendant….” This change implies that exonerating statements/testimony need not be corroborated or viewed with caution the instruction so counsel may wish to request an instruction which expressly explains this distinction.
Furthermore, the defense could object to CC 334 if the accomplice testimony is “solely exculpatory or neutral.” (See CC 334, Bench Notes [citing Smith].)
Support for the above proposals is rooted in fundamental constitutional principles. In Washington v. Texas (1967) 388 U.S. 14, the United States Supreme Court held that a criminal defendant has a Sixth Amendment right to present exculpatory testimony of an accomplice to the jury. In Cool v. United States (1972) 409 U.S. 100, 104, the Court held that instructing a jury to ignore defense accomplice testimony unless the jury believed the testimony to be true beyond a reasonable doubt “impermissibly obstruct[ed] the exercise of that right” and “ha[d] the effect of substantially reducing the Government’s burden of proof.”
Sample Instruction (add at end of CC 334):
The above rules do not apply accomplice testimony or statements which are neutral or tend to negate or disprove any essential fact or element of the charged offense.