CALIFORNIA CRIMINAL EVIDENCE: WE HAVE THE RIGHT TO CHALLENGE BREATH TESTING
A series of cases being handed down by the U.S. Supreme Court and California Court of appeals are being heralded by prosecutors as "new law." Once such case is the U.S. Supreme Court's decision in Bullcoming. Another is Vangelder, discussed below.
What is frightening about this prosecutorial harkening, however, is that none of this really is new law at all. It's always been the law. It's just that prosecutors and rogue judges' deviate from it. The "norm" has been: Violate Due Process and the evidence code in order to assist the prosecution in obtaining convictions.
But the U.S. Supremes recently, and now the California Court of Appeal, are pinning their ears back. And they better listen.
COURT OF APPEAL SAYS WE HAVE THE RIGHT TO CHALLENGE BREATH TESTING DEVICES
The California Supreme Court has held that we can't challenge the partition ratio used to prove that a defendant was driving at or above .08. Note that we can challenge it on the DUI charge itself, though only if we can show a problem with this specific defendant, not just general problems with partition ratio. (McNeal, 46 C4th 1183.)
Here, the trial judge entirely barred the defense expert from testifying that breath testing devices (PAS and breath testing machines) are unreliable because of problems getting pure data about blood alcohol from the intake of air. The expert would testify to problems affecting the amount of alcohol found in the alveolar air supposedly being tested. The California Court of Appeal says that the exclusion of the expert's testimony was error, with respect to both the .08 and the DUI charges. The California Court of Appeal says that this differs from partition ratios. Big defense win; Chuck Sevilla, San Diego PC, was successful appellate counsel.
People v. Vangelder; 2011 DJ DAR 9949; DJ, 7/5/11; C/A 4th, Div. 1




