The U. S. Supreme Court ruled defendants have the right to confront one's accuser in DUI and Lidar speeding cases.

The high court examined the question of whether a lab report could be introduced as evidence by an "expert" who did not actually conduct the tests in question. The prosecution argued that the gas chromatograph machine was the accuser in the case and that Caylor simply wrote down the result without exercising independent judgment. For that reason, Razatos was an equivalent substitute. The court disagreed.

"Suppose a police report recorded an objective fact -- Bullcoming's counsel posited the address above the front door of a house or the read-out of a radar gun," Justice Ruth Bader Ginsburg wrote for the majority. "Could an officer other than the one who saw the number on the house or gun present the information in court -- so long as that officer was equipped to testify about any technology the observing officer deployed and the police department's standard operating procedures? As our precedent makes plain, the answer is emphatically 'No.'"

The court majority noted that using a surrogate witness would conceal any lapses or lies on the part of the certifying analyst. It also noted that the burden on the prosecution from the requirement of live testimony could have been cured by having Razatos retest the blood sample, which was preserved in accordance with New Mexico law.

"As a rule, if an out-of-court statement is testimonial in nature, it may not be introduced against the accused at trial unless the witness who made the statement is unavailable and the accused has had a prior opportunity to confront that witness," Ginsburg concluded.

Supreme Court Ruling:
http://www.thenewspaper.com/rlc/docs/2011/us-bullcoming.pdf