We granted certiorari to review the decision of the Colorado Court of Appeals in
People v. Marquiz,
I.
The defendant’s convictions stem from the slaying of seventeen-year-old Debra *1106 Terhorst early in January of 1981. According to evidence presented at trial, Marquiz believed that the victim had stolen some property from his apartment, and he resolved to kill her. Marquiz enlisted the cooperation of Rudy Gallegos and Antonio Laroza in this endeavor. The three men induced the victim to accompany them to a location on Lookout Mountain, where they stabbed her several times and cut her throat, resulting in her death.
Shortly after the killing, Marquiz, Gallegos and Laroza were arrested and charged with first-degree murder and conspiracy to commit first-degree murder. §§ 18-3-102 and 18-2-201, 8B C.R.S. (1986). The cases against the three defendants were severed for trial. A jury found Gallegos guilty of first-degree murder but not guilty of conspiracy to commit first-degree murder. A separate jury acquitted Laroza of both the murder charge and the conspiracy charge. The trial of Marquiz did not begin until May 17, 1982, well after the trials of the other two defendants had been completed. 2
A jury found Marquiz guilty of both first-degree murder and conspiracy to commit first-degree murder. He was sentenced to concurrent terms of life imprisonment for first-degree murder and twelve years for conspiracy to commit first-degree murder. Marquiz appealed his judgment of conviction to the court of appeals, asserting several grounds for reversal. The court of appeals upheld the convictions, and we granted certiorari limited to the issue of whether Marquiz could properly be convicted of conspiracy after both Gallegos and Laroza had been acquitted of conspiracy charges in separate trials.
II.
The rule of consistency, simply stated, is that where all alleged coconspira-tors but one are acquitted of conspiracy, the remaining alleged coconspirator may not be convicted of conspiracy.
Bradley v. People,
The rule of consistency has its origins in a time when all alleged coconspirators were routinely charged in the same proceeding.
See Platt v. State,
First, it insures that the jury will adhere to the conspiracy requirement of-the concurrence of at least two guilty minds; and second, it prevents the jury from weighing the same pieces of evidence differently in regard to each of the alleged conspirators.
People v. Superior Court,
There is no inherent inconsistency when different juries return different verdicts in separate trials, because the acquittal of one of the conspirators “ ‘could [result] from a multiplicity of factors completely unrelated to the actual existence of a conspiracy.’ ”
Commonwealth v. Byrd,
Different verdicts may also result simply from the different compositions of the juries. Separate juries may reasonably take different views of the same evidence. “Moreover, the jury may assume the power to acquit out of compassion or prejudice, and the prosecution is then powerless to seek a judgment notwithstanding the verdict or a new trial on the ground that the verdict is against the weight of the evidence.”
Commonwealth v. Cerveny,
The value of the rule of consistency as a check upon the jury also disappears in the context of separate trials.
Application of the consistency rule in this situation neither insures that the two juries understand the crime of conspiracy nor that they evaluated the facts of the case consistently in regard to each conspirator.
People v. Superior Court,
We conclude that the policies sought to be furthered by the rule of consistency are not served by application of the rule to situations in which all alleged coconspira-tors are not tried in the same proceeding. 5
The judgment of the court of appeals is affirmed. 6
Notes
. The People also urge us to hold that the doctrine of nonmutual collateral estoppel is inapplicable to criminal prosecutions in which defendants are tried separately. The petitioner, however, does not rely on the doctrine before this court and we therefore decline to resolve the issue.
We note that the United States Supreme Court has held unanimously that the doctrine of non-mutual collateral estoppel does not apply to criminal prosecutions under federal law. Standefer v. United States,447 U.S. 10 ,100 S.Ct. 1999 ,64 L.Ed.2d 689 (1980). It has been held by at least one state court that the doctrine bars the prosecution of an alleged conspirator after the acquittal of his alleged coconspirator in a separate trial. People v. Superior Court,44 Cal.App.3d 494 ,118 Cal.Rptr. 702 (1975). This view has been rejected by other state courts. E.g., People v. Berkowitz,428 N.Y.S.2d 927 ,50 N.Y.2d 333 ,406 N.E.2d 783 (1980). Significantly, the reasons for rejecting the doctrine in criminal cases appear to be largely identical to those that we hold today militate against application of the rule of consistency in this context.
. The trial of Marquiz was delayed due to proceedings regarding his competency to stand trial and his plea of not guilty by reason of insanity.
The opinion of the court of appeals details those proceedings.
People
v.
Marquiz,
. Today, prosecutions of multiple defendants for conspiracy are frequently severed for trial. Section 18-2-202(2)(c), 8B C.R.S. (1986), provides in pertinent part:
(2) In any joint prosecution under subsection (1) of this section [relating to criminal conspiracy]:
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(c) The court shall order a severance ... as to any defendant who so requests, if it deems it necessary or appropriate to promote the fair determination of his guilt or innocence.
. It has been suggested that the rule may not retain its validity in any context because of the "true nature of an acquittal in the American criminal justice system.”
United States v. Espinosa-Cerpa,
. The People also contend that Marquiz’s girlfriend was an unindicted coconspirator with whom Marquiz conspired. The parties agree that a defendant may be convicted of conspiracy notwithstanding the fact that all other indicted coconspirators have been acquitted if it is alleged and proved that there is an unindicted person with whom the defendant conspired.
See, e.g., United States v. Maniego,
. The People urge us to hold that our conspiracy statute, section 18-2-201, 8B C.R.S. (1986), adopts the ‘'unilateral" theory of conspiracy, whereby agreement on the part of only one person is sufficient to establish the crime. Section 18-2-201(1) provides:
A person commits conspiracy- to commit a crime if, with the intent to promote or facilitate its commission, he agrees with another person or persons that they, or one or more of them, will engage in conduct which constitutes a crime or an attempt to commit a crime, or he agrees to aid the other person or persons in the planning or commission of a crime or of an attempt to commit such crime.
However, in view of our rejection of the applicability of the rule of consistency in the context of separate trials of alleged coconspirators, it is not necessary for us to determine whether the People’s position is correct. Prior to the adoption of the present conspiracy statute in 1971, ch. 121, § 40-2-201, 1971 Colo.Sess.Laws 388, 415-16 (now codified at § 18-2-201, 8B C.R.S.), we held uniformly that conspiracy required an agreement between two or more persons.
E.g., Pooley v. People,
