State v. Plata Iniguez, 526 P.3d 1003

After a collision in January 2019, officers observed signs of intoxication and Plata admitted driving and drinking; he failed three field sobriety tests and was handcuffed and arrested without a warrant for misdemeanor DUI.
Plata was transported to the Ada County Jail where he attempted breath testing, failed to produce an adequate breath sample, and refused a blood draw.
Officers obtained a magistrate-issued search warrant at the Jail (affidavit included both pre-arrest facts and post-arrest breath-refusal facts) and a blood sample showed BAC 0.131.
Plata moved to suppress the blood evidence after this Court decided State v. Clarke (holding warrantless arrests for misdemeanors completed outside an officer’s presence unconstitutional).
Magistrate denied suppression; the district court (on intermediate appeal) affirmed, finding the pre-arrest facts supported the warrant and there was no causal nexus; Plata appealed to the Idaho Supreme Court.
The Idaho Supreme Court held Plata made a prima facie showing that the illegal arrest caused the chain leading to the blood draw, the State failed to preserve or prove any established exception to exclusion, and Idaho will not adopt a reasonable mistake-of-law exception—blood evidence suppressed and lower decision reversed.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether the blood draw evidence is "fruit" of Plata's illegal warrantless misdemeanor arrest	Plata: arrest caused transport to jail → breath testing → breath refusal → warrant for blood → blood draw; prima facie causal nexus exists	State: pre-arrest information alone provided probable cause for the blood-warrant so no causal nexus	Court: Plata met prima facie burden; causal chain tied to illegal arrest (transport/detention at jail) so initial nexus established
Whether the State proved an exception (independent source, inevitable discovery, or attenuation) to permit admission	Plata: State must prove an exception to purge taint; none shown or preserved	State: argued no nexus and relied on pre-arrest facts; did not properly preserve or develop inevitable discovery/attenuation arguments below	Court: State failed to preserve or carry burden on any established exception; therefore suppression proper
Whether Idaho should adopt a reasonable mistake-of-law exception to its exclusionary rule	Plata: such an exception would undermine Idaho’s broader exclusionary-rule purposes; reject it	State: asks Court to adopt Heien-style reasonable mistake-of-law exception because officer reasonably relied on then-valid statute authorizing arrest	Court: rejected adoption—Idaho’s Article I, §17 exclusionary rule provides broader protections and remedies (deterrence, judicial integrity, etc.), so no mistake-of-law exception

State v. Clarke, 165 Idaho 393 (2019) (warrantless arrests for misdemeanors completed outside an officer’s presence violate Article I, §17)
State v. Vivian, 171 Idaho 79 (2022) (defendant bears initial burden to show factual nexus between illegality and challenged evidence; established exceptions listed)
State v. Guzman, 122 Idaho 981 (1992) (Idaho rejected federal good-faith exception; articulated broader purposes of Idaho’s exclusionary rule)
Heien v. North Carolina, 574 U.S. 54 (2014) (U.S. Supreme Court recognized reasonable-mistake-of-law doctrine under Fourth Amendment)
Wong Sun v. United States, 371 U.S. 471 (1963) (attenuation/purging analysis for derivative evidence)
Segura v. United States, 468 U.S. 796 (1984) (fruit-of-the-poisonous-tree principle; limits on derivative evidence)
State v. Downing, 163 Idaho 26 (2017) (discusses inevitable discovery doctrine in Idaho)