Detective Corkill obtained written consent from co-resident Madrid before supervising the subsequent search of the residence. The detective found the murder weapon on the top shelf of the closet in the detached bedroom.
I
Defendant asserts that the State violated the rule established in Brady v. Maryland, 373 U.S. 83, 83 S.Ct. 1194, 10 L.Ed.2d 215 (1963), by failing to test his blood alcohol content at the time of his arrest. The defendant contends that the State’s failure to conduct the test was tantamount to losing or destroying evidence favorable to the defense. Consequently, defendant claims he is entitled to dismissal of the first degree murder charge. In the alternative, defendant asserts that he was entitled to a Willits instruction. See State v. Willits, 96 Ariz. 184, 393 P.2d 274 (1964).1
A defendant’s due process right to a fair trial is violated when the State either suppresses or destroys evidence favorable to him and he is prejudiced thereby. See Brady v. Maryland, 373 U.S. at 87, 83 S.Ct. at 1196-97, 10 L.Ed.2d at 218; Scales v. City Court of Mesa, 122 Ariz. 231, 234, 594 P.2d 97, 100 (1979). We have recently expanded on this rule to find that the State also has a duty “to ensure the preservation of evidence it is aware of where that evidence is obviously material and reasonably within its grasp.” State v. Perez, 141 Ariz. 459, 463, 687 P.2d 1214, 1218 (1984) (emphasis added). The action necessary to cure the State’s violation of the defendant’s right depends upon the prejudice caused to the defendant. In cases where the State has suppressed evidence and the evidence is still available, the defendant’s due process right is protected by granting him a new trial. See Brady, supra. In instances where the evidence is no longer available because the State has destroyed the evidence or failed in its duty to preserve the evidence, the defendant’s due process right may nonetheless be protected by the court giving a Willits instruction to the jury. See Perez, 141 Ariz. at 464, 687 P.2d at 1219. However, if the State has destroyed evidence and the prejudice caused to the defendant is great or the State acted in bad faith or with connivance, the charges against the defendant must be dropped or his conviction reversed; a Willits instruction is insufficient to cure the violation of the defendant’s due process right. See Scales, 122 Ariz. at 234, 594 P.2d at 100; State v. Hannah, 120 Ariz. 1, 2, 583 P.2d 888, 889 (1978).
We hold that in this case, defendant’s due process right to a fair trial has not been violated because the State did not suppress, destroy or fail to preserve evidence. Rather, the State chose not to gather evidence of defendant’s blood alcohol level to prove its case.
Generally, the State does not have an affirmative duty to seek out and gain possession of potentially exculpatory evidence. See Montano v. Superior Court, 149 Ariz. 385, 389, 719 P.2d 271, 275 (1986); Perez, 141 Ariz. at 463, 687 P.2d at 1218. We have recently discussed this rule in the limited context of DUI (“driving under the influence”) cases. In such cases where specialized blood alcohol tests have been employed by the State, we have required that the police preserve the ampoule or sample of the defendant’s breath for testing by the defense. See, e.g., Scales, 122 Ariz. at 234, 594 P.2d at 100; Baca v. Smith, 124 Ariz. 353, 356, 604 P.2d 617, 620 (1979). Blood alcohol evidence is frequently a dispositive element in the State’s proof of a DUI charge because under the DUI statute, a blood alcohol level of 0.10 percent or more raises a presumption that the defendant was under the influence. A.R.S. § 28-692(E)(3). Our rulings in Scales, Baca and Montano simply provide safeguards for the defendant to insure the
1
A Willits instruction usually states: Willits, 96 Ariz. at 187, 393 P.2d at 276.