Horn v. New Haven

District Court, D. Connecticut·Decided April 2, 2024·No. 3:18-cv-01502·Unknown

Opinion

UNITED STATES DISTRICT COURT DISTRICT OF CONNECTICUT

VERNON HORN,

Plaintiff,

V. No. 3:18-cv-1502(RNC)

CITY OF NEW HAVEN, ET AL.,

Defendants. _______________________________ ______________

MARQUIS JACKSON,

V. No. 3:19-cv-388(RNC)

Defendants.

RULING AND ORDER Plaintiffs Vernon Horn and Marquis Jackson bring these consolidated actions under 42 U.S.C. § 1983 and state law against the City of New Haven, former New Haven Police Department Detectives Leroy Dease, Petisia Adger and Daryle Breland, and State of Connecticut firearms examiner James Stephenson. The actions arise from a murder that occurred in 1999 during an early

morning robbery of a 24-hour convenience store in New Haven. The plaintiffs were convicted of the murder and other offenses after a jury trial based on the testimony of Steven Brown, who pleaded guilty and

testified that the plaintiffs were primarily responsible for the robbery-murder. Brown testified that Horn was armed with a pistol that looked like a Beretta and began firing it immediately upon entering

the store. Stephenson testified that based on his analysis of the ballistics evidence, the murder weapon could have been a Beretta. The plaintiffs’ convictions

were vacated in 2018 in light of newly discovered evidence. The charges were then dismissed. The plaintiffs have always claimed that they never

met or spoke with Brown prior to their arrests for the robbery-murder, and they continue to maintain that they are actually innocent. They claim that their wrongful convictions and lengthy imprisonment were caused by

the Detectives, the City, and Stephenson - the Detectives because they engaged in investigative

misconduct; the City because it was deliberately indifferent to the Detectives’ violations of the plaintiffs’ rights as suspects in the investigation; and Stephenson because he failed to disclose

exculpatory information to the trial prosecutor in violation of Brady v. Maryland, 373 U.S. 83 (1963). The Amended Complaint advances thirteen claims in

all. Discovery having been completed, all the defendants have moved for summary judgment on all the claims. The motions filed by the Detectives have been

granted in part and denied in part. See Horn v. City of New Haven, No. 19-cv-388, 2024 WL 1261421 (Mar. 19, 2024)(ruling on Detectives’ motion for summary judgment on federal claims); Horn v. City of New Haven, No. 19-

CV-388, 2024 WL 1342762 (Mar. 29, 2024)(ruling on Detectives’ motion for summary judgment on state law claims). And the City’s motion has also been granted in part and denied in part. See ECF 330, 334. This

memorandum addresses Stephenson’s motion. For reasons that follow, the motion is granted.

I. On January 24, 1999, at about 3:25 a.m., three masked gunmen burst into the Dixwell Deli in New Haven.

The first to enter sprayed five or six bullets from a 9 mm pistol in the general direction of the cash register, killing Caprice Hardy, a customer, and wounding Yousif Abbey, an employee.

Four days later, the New Haven Police Department sent cartridge casings, bullets and bullet fragments

recovered from the scene to the State Police Forensic Science Laboratory and requested that they be analyzed. Stephenson, an experienced firearms examiner at

the Lab, received the request submitted by the NHPD. His duty was to determine what kind of gun or guns might have fired the bullets recovered from the crime

scene. For this purpose, firearms examiners use the General Rifling Characteristics Database (GRC Database) maintained by the F.B.I. and distributed to firearms examiners throughout the country. The goal of querying the GRC Database is to

identify firearms that could have fired bullets recovered from a crime scene. A query includes the caliber of a bullet, the number of lands and grooves on the bullet (impressions made by the firearm’s barrel on

the bullet), and measurements of the land widths and groove widths on the bullet, in one thousandths of an inch.

The examiner also includes a margin of error (or “tolerance range”) for either side of measurements: so if the land width is 50, and the margin of error is +/-

2 one thousandths of an inch, the database will search for results with a land width of 48 to 52. The Database then provides a list of firearms manufacturers and models consistent with the information submitted by

the examiner. In selecting a margin of error, an examiner makes a judgment call based on his training and experience

and his measurements of the physical evidence. The objective is to set the margin of error at what might be called the Goldilocks point – narrow enough to avoid

getting too many firearms in the response but not so narrow as to produce an unhelpful result. The margin of error that makes sense under the circumstances depends on the measurements of the physical evidence.

With several projectiles that all have the same measurements, a small margin of error may produce a usable result. With different measurements, a larger margin of error may be necessary.

Many firearms examiners use +/-5 one thousandths of an inch as their normal default range. This is in

accordance with tolerance ranges approved by the F.B.I. GRC Manual. It is also consistent with accepted standards of practice in the field.

Stephenson measured the land and groove impressions on the bullets and bullet fragments and queried the GRC Database to determine what kind of gun could have fired the bullets. In formulating his

query, he chose a margin of error (or “tolerance range”) of +/-2 one thousandths of an inch based on his training, experience, judgment and measurements of the

physical evidence. He “thought that [+/-2] was the right margin of error to use under the circumstances.” It “made sense . . . because [he was] pretty confident based on the physical measurements that the actual land

and groove width of the firearm that fired the[] bullets would be close to 69 and 105.” In response to the query, the computer system

produced a printout – called a GRC Report - containing a list of manufacturers and models of firearms that could have been used to fire the projectiles recovered

from the scene. Beretta was not among them. On February 4, 1999, Stephenson prepared a standard report in the format used by the Firearms

Section of the State Police Forensic Science Lab. The report described the evidence submitted and the results of the firearms examination. The report was signed by Stephenson and another firearms examiner in the

Forensic Science Lab. Stephenson sent the report to the NHPD. The report stated: The bullet and bullet fragments are consistent with being 9mm caliber. They may have been fired from but not limited to a self loading pistol manufactured by Calico, FEG, Browning, Heckler & Koch, Hungarian, Kassnar, Norinco or Walther.

During Stephenson’s time working as a firearms examiner in the State Forensic Lab, it was normal, standard practice to transmit a signed report to the requesting agency setting forth the examiner’s conclusions without also transmitting work materials such as GRC documents, worksheets, or other notes or research material. An examiner would provide these materials to the prosecutor in advance of a criminal

trial if a specific request was made by the prosecutor or defense attorney. In other jurisdictions, it was standard practice to affirmatively provide exculpatory information to the prosecutor without a request. But

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