Melendez-Diaz v. Massachusetts
E821196
Melendez-Diaz v. Massachusetts is a 2009 U.S. Supreme Court decision holding that forensic laboratory reports are testimonial evidence and that defendants have a Sixth Amendment right to confront the analysts who prepared them.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Melendez-Diaz v. Massachusetts canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T9799016 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Melendez-Diaz v. Massachusetts Context triple: [Crawford v. Washington, subsequentCaseInterpreting, Melendez-Diaz v. Massachusetts]
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A.
Memoirs v. Massachusetts
Memoirs v. Massachusetts is a 1966 U.S. Supreme Court decision that refined the legal test for obscenity under the First Amendment, further protecting controversial literary works from censorship.
-
B.
Prince v. Massachusetts
Prince v. Massachusetts is a 1944 U.S. Supreme Court decision that upheld state authority to regulate child labor and limit children's religiously motivated activities in public for their protection.
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C.
McCullen v. Coakley
McCullen v. Coakley is a 2014 U.S. Supreme Court case that struck down Massachusetts’ abortion-clinic buffer zone law as violating the First Amendment’s free speech protections.
-
D.
Garcetti v. Ceballos
Garcetti v. Ceballos is a 2006 U.S. Supreme Court decision holding that public employees do not have First Amendment protection for speech made pursuant to their official job duties.
-
E.
First National Bank of Boston v. Bellotti
First National Bank of Boston v. Bellotti is a landmark 1978 U.S. Supreme Court decision that expanded First Amendment protections by recognizing corporations’ rights to spend money to influence ballot initiatives.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Melendez-Diaz v. Massachusetts Target entity description: Melendez-Diaz v. Massachusetts is a 2009 U.S. Supreme Court decision holding that forensic laboratory reports are testimonial evidence and that defendants have a Sixth Amendment right to confront the analysts who prepared them.
-
A.
Memoirs v. Massachusetts
Memoirs v. Massachusetts is a 1966 U.S. Supreme Court decision that refined the legal test for obscenity under the First Amendment, further protecting controversial literary works from censorship.
-
B.
Prince v. Massachusetts
Prince v. Massachusetts is a 1944 U.S. Supreme Court decision that upheld state authority to regulate child labor and limit children's religiously motivated activities in public for their protection.
-
C.
McCullen v. Coakley
McCullen v. Coakley is a 2014 U.S. Supreme Court case that struck down Massachusetts’ abortion-clinic buffer zone law as violating the First Amendment’s free speech protections.
-
D.
Garcetti v. Ceballos
Garcetti v. Ceballos is a 2006 U.S. Supreme Court decision holding that public employees do not have First Amendment protection for speech made pursuant to their official job duties.
-
E.
First National Bank of Boston v. Bellotti
First National Bank of Boston v. Bellotti is a landmark 1978 U.S. Supreme Court decision that expanded First Amendment protections by recognizing corporations’ rights to spend money to influence ballot initiatives.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Confrontation Clause case
ⓘ
United States Supreme Court case ⓘ criminal procedure case ⓘ |
| areaOfLaw |
constitutional law
ⓘ
criminal law ⓘ evidence law ⓘ |
| arguedDate | November 10, 2008 ⓘ |
| citation | 557 U.S. 305 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| court | Supreme Court of the United States ⓘ |
| decisionDate | June 25, 2009 ⓘ |
| decisionType | 5–4 decision ⓘ |
| dissentingOpinionBy | Justice Anthony M. Kennedy NERFINISHED ⓘ |
| docketNumber | No. 07-591 ⓘ |
| holding |
Admission of sworn forensic certificates without live testimony violates the Confrontation Clause unless the analyst is unavailable and the defendant had a prior opportunity for cross-examination.
ⓘ
Defendants have the right to confront and cross-examine the analysts who prepare forensic laboratory reports used against them at trial. ⓘ Forensic laboratory certificates reporting the results of drug analysis are testimonial statements under the Confrontation Clause of the Sixth Amendment. ⓘ |
| impact |
Required live testimony or prior cross-examination of forensic analysts whose reports are used as evidence.
ⓘ
Strengthened defendants' confrontation rights regarding forensic evidence. ⓘ |
| issue |
Whether certificates of state laboratory analysts identifying a substance as cocaine are testimonial evidence.
ⓘ
Whether the prosecution may introduce forensic lab reports without calling the analysts as witnesses. ⓘ |
| joinedByInDissent |
Chief Justice John G. Roberts Jr.
NERFINISHED
ⓘ
Justice Samuel A. Alito Jr. NERFINISHED ⓘ Justice Stephen G. Breyer NERFINISHED ⓘ |
| joinedByInMajority |
Justice Clarence Thomas
NERFINISHED
ⓘ
Justice David H. Souter NERFINISHED ⓘ Justice John Paul Stevens NERFINISHED ⓘ Justice Ruth Bader Ginsburg NERFINISHED ⓘ |
| jurisdiction |
Massachusetts
ⓘ
surface form:
Commonwealth of Massachusetts
|
| legalProvisionInterpreted |
Confrontation Clause
NERFINISHED
ⓘ
Sixth Amendment to the United States Constitution NERFINISHED ⓘ |
| majorityOpinionBy | Justice Antonin Scalia NERFINISHED ⓘ |
| page | 305 ⓘ |
| party |
Commonwealth of Massachusetts
NERFINISHED
ⓘ
Luis E. Melendez-Diaz NERFINISHED ⓘ |
| relatedToCase |
Bullcoming v. New Mexico
NERFINISHED
ⓘ
Crawford v. Washington NERFINISHED ⓘ Williams v. Illinois NERFINISHED ⓘ |
| reporter | United States Reports ⓘ |
| result | Conviction reversed and case remanded. ⓘ |
| stateProcedureChallenged | Massachusetts practice of admitting sworn drug analysis certificates without analyst testimony ⓘ |
| subsequentCitationFrequency | frequently cited in Confrontation Clause jurisprudence ⓘ |
| topic |
criminal prosecutions involving drug analysis
ⓘ
forensic science evidence ⓘ testimonial evidence ⓘ |
| volume | 557 ⓘ |
| yearDecided | 2009 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Melendez-Diaz v. Massachusetts Description of subject: Melendez-Diaz v. Massachusetts is a 2009 U.S. Supreme Court decision holding that forensic laboratory reports are testimonial evidence and that defendants have a Sixth Amendment right to confront the analysts who prepared them.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.