In August 2005, a vehicle driven by Donald Bullcoming rear-ended a pickup truck at an intersection in Farmington, New Mexico. The truck driver noticed Bullcoming had bloodshot eyes and smelled of alcohol. Bullcoming left the scene but was soon apprehended by a police officer.
He failed the field sobriety tests. He then refused to take a breath test. Since the police suspected he was driving under the influence, they obtained a search warrant, took him to a local hospital, and drew a sample of his blood.
The Farmington police shipped that blood sample to the New Mexico Department of Health Scientific Laboratory Division. A forensic analyst named Curtis Caylor received the vial and ran the test. He signed a report certifying that Bullcoming's blood alcohol concentration was 0.21. That number is significantly over the legal limit. It pushed the state's case into aggravated DWI territory under NMSA 66-8-102, which carries much harsher penalties.
The state built its entire prosecution around that piece of paper. Then the trial date arrived, and the prosecution realized they had a serious problem.
Curtis Caylor was on unpaid leave. The state chose not to call him to the witness stand. Instead, the prosecution called a different scientist from the state laboratory named Gerasimos Razatos. Razatos was perfectly familiar with the lab equipment and standard testing procedures. But he had never touched Bullcoming's blood sample. He did not watch Caylor run the test. He had absolutely no personal knowledge of what happened in the lab that day.
The defense objected immediately.
They argued that allowing a substitute witness to read Caylor's report to the jury violated the Sixth Amendment of the United States Constitution. The trial judge overruled the objection and let the surrogate witness testify. The jury convicted Bullcoming of aggravated DWI. He appealed, and the New Mexico Supreme Court eventually upheld the conviction.
The state court reasoned that the gas chromatograph machine was the true accuser. They decided Caylor was just a scrivener transcribing a number from a computer screen. Since Razatos was an expert in the testing machines, the state court felt he was a perfectly acceptable substitute witness.
The United States Supreme Court disagreed entirely.
They took the case and reversed the conviction. The resulting opinion in Bullcoming v. New Mexico completely changed how prosecutors handle forensic evidence across the country.
The Sixth Amendment guarantees an accused person the right to be confronted with the witnesses against them. This constitutional protection stops the government from prosecuting people based on written reports or secret testimony where the defense cannot cross-examine the source. Cross-examination is the mechanism courts use to test the truth. You cannot cross-examine a piece of paper.
The State of New Mexico argued that the blood alcohol report was merely a routine business record. The Supreme Court rejected that logic out of hand. A blood test report prepared for a criminal trial is a testimonial statement. The state creates it for the express purpose of proving a fact in a criminal prosecution. Since it is testimonial evidence, the specific person who made the statement must appear in court.
Sending a qualified substitute is not a valid constitutional workaround. Razatos could explain the math and the machinery to the jury. But he could not answer any questions about what Caylor actually did during the testing process.
Caylor signed a certification stating he received the blood sample with the seal intact. He certified that he followed precise laboratory protocols. He left the remarks section of the report blank, indicating no unusual conditions affected the sample. These are specific human actions and observations.
Testing a blood sample is not a simple matter of pushing a button and reading a screen. The analyst must extract the blood, mix it with an internal standard chemical additive, cap the vials, crimp them, and load them into the machine. Mistakes happen at every single step of this process. Vials get mixed up. Chemicals degrade. Analysts take shortcuts.
Since Caylor was absent, the defense lost the chance to ask him about his methods. They could not ask him if he was distracted. They could not ask him why the state laboratory placed him on unpaid leave right before the trial. The jury never got the opportunity to evaluate Caylor's competence or his honesty.
A substitute witness cannot expose the mistakes or lies of the absent analyst. The Constitution requires the specific person who made the certification to face the accused in the courtroom.
Blood evidence usually feels unbeatable to a jury. A scientific report printed on state letterhead looks official and final. The Bullcoming decision shows exactly why that assumption is flawed. The number printed out by a machine is only as reliable as the human being operating the equipment.
When the state wants to secure a conviction based on a blood test, they have to bring the tester to court.
This creates massive logistical hurdles for prosecutors. New Mexico has a huge geographic footprint. The Scientific Laboratory Division operates out of a central location, and its analysts process thousands of samples every year. Forcing those analysts to travel to courthouses in Farmington, Roswell, and Las Cruces requires massive amounts of time and state resources.
Analysts sometimes quit. They get fired. They retire or move out of state.
When the original analyst becomes unavailable, the state cannot just grab the next technician in the hallway to read the file. The prosecution must either retest the sample with a new analyst or drop the scientific evidence entirely. If the blood sample was not properly preserved for a retest, the state simply loses its proof.
Prosecutors complained loudly about this rule. They argued that requiring the actual analyst would impose an unbearable administrative burden on the justice system. The Supreme Court dismissed that concern. The Constitution does not bend to make the prosecution's job easier. The framers wrote the Sixth Amendment to protect individuals from state power. They knew trials would be harder and more expensive when the government is forced to produce live witnesses in open court. That was a deliberate design choice.
The state always bears the burden of proof.
New Mexico courts previously allowed forensic reports to slide into evidence under various hearsay exceptions. Bullcoming closed those loopholes. The highest court in the land made it explicitly clear that forensic evidence is not immune to constitutional scrutiny just because it involves science.
The state relied heavily on the argument that the blood test was reliable. The New Mexico Supreme Court felt the machine's apparent accuracy was the determining factor. The US Supreme Court pointed out the fundamental flaw in that reasoning. The Confrontation Clause does not command that evidence be reliable. It commands that reliability be assessed in a very specific way. That way is testing the evidence through cross-examination.
Even if an analyst is a world-renowned scientist, their reports must still face a defense attorney's questions.
This ruling fundamentally shifts the balance of power in a DWI prosecution. The police hold all the cards during the initial arrest and investigation. They control the timeline. They control the evidence collection. But inside the courtroom, the Constitution levels the playing field. The state cannot hide behind paperwork and substitute witnesses. They have to put their actual accusers on the stand.
If the prosecution fails to produce the analyst, the blood test report stays out of evidence. A DWI case built entirely on a blood test falls apart quickly when that piece of paper is excluded. The Farmington crash that started this case ended up rewriting the rules of evidence for the entire country. It reaffirmed that human accountability is strictly required in a legal system that tries to rely on machines.
Patrick J. Martinez
Attorney at Law
25+ years of trial experience in Albuquerque, NM
