Nebraska

Study: Wire-cut forensic exams currently too unreliable for court

Published

2 years ago

June 10, 2024

Study: Wire-cut forensic exams currently too unreliable for court

A research article published June 10 in the Proceedings of the National Academy of Sciences highlights the importance of careful application of high-tech forensic science to avoid wrongful convictions.

In a study with implications for an array of forensic examinations that rely on “vast databases and efficient algorithms,” researchers found the odds of a false match significantly increase when examiners make millions of comparisons in a quest to match wires found at a crime scene with the tools allegedly used to cut them.

The rate of mistaken identifications could be as high as one in 10 or more, concluded the researchers, who are affiliated with the Center for Statistics and Applications in Forensic Evidence, based in Ames, Iowa.

“It is somewhat of a counterintuition,” said co-author Susan VanderPlas, an assistant professor of statistics at the University of Nebraska-Lincoln. “You are more likely to find the right match — but you’re also more likely to find the wrong match.”

VanderPlas worked as a research professor at CSAFE before moving to Nebraska in 2020. Co-authors of the study, “Hidden Multiple Comparisons Increase Forensic Error Rates,” were Heike Hoffmann and Alicia Carriquiry, both affiliated with CSAFE and Iowa State University’s Department of Statistics.

Wire cuts and tool marks are frequently used as evidence in robberies, bombings and other crimes. In the case of wire cuts, tiny striations on the cut ends of a wire may be matched to one of many available tools in a toolbox or garage. Comparing the evidence to more tools increases the chances that similar striations may be found on unrelated tools, resulting in a false accusation and conviction.

Wire-cutting evidence has been at issue in at least two cases that garnered national attention, including one where the accused was linked to a bombing based on a small piece of wire, a tiny fraction of an inch in diameter, that was matched to a tool found among the suspect’s belongings.

“Wire-cutting evidence is used in court and, based on our findings, it shouldn’t be — at least not without presenting additional information about how many comparisons were made,” VanderPlas said.

Wire cutting evidence is evaluated by comparing the striations found on the cut end of a piece of wire against the cutting blades of tools suspected to have been used in the crime. In a manual test, the examiner slides the end of the wire along the path created along another piece of material cut by the same tool to see where the pattern of striations match.

An automated process uses a comparison microscope and pattern-matching algorithms, to find possible matches pixel by pixel.

This can result in thousands upon thousands of individual comparisons, depending upon the length of the cutting blade, diameter of the wire and even the number of tools checked.

For example, VanderPlas said she and her husband tallied the various tin snips, wire cutters, pliers and similar tools stored in their garage and came up with a total of 7 meters in blade length.

Examiners may not even be aware of the number of comparisons they are making as they search for a matching pattern, because those comparisons are hidden in the algorithms.

“This often-ignored issue increases the false discovery rate, and can contribute to the erosion of public trust in the justice system through conviction of innocent individuals,” the study authors wrote.

Forensic examiners typically testify based upon subjective rules about how much similarity is required to make an identification, the study explained. The researchers could not obtain error rate studies for wire-cut examinations and used published error rates for ballistics examinations to estimate possible false discovery rates for wire-cut examinations.

Before wire-cut examinations are used as evidence in court, the researchers recommended that:

Examiners report the overall length or area of materials used in the examination process, including blade length and wire diameter. This would enable examination-wide error rates to be calculated.
Studies be conducted to assess both false discovery and false elimination error rates when examiners are making difficult comparisons. Studies should link the length and area of comparison to error rates.
The number of items searched, comparisons made and results returned should be reported when a database is used at any stage of the forensic evidence evaluation process.

The VanderPlas article joins other reports calling for improvements in forensic science in America. The National Academies Press, publisher of the PNAS journal and other publications of the National Academies of Sciences, Engineering and Medicine, also published the landmark 2009 report “Strengthening Forensic Science in the United States: A Path Forward.”

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Nebraska

Nebraska State Patrol troopers find 242 pounds of cocaine during commercial truck inspection

Published

2 hours ago

February 27, 2026

Press Room

Nebraska State Patrol troopers find 242 pounds of cocaine during commercial truck inspection

LEXINGTON, Neb. (KOLN) – Troopers with the Nebraska State Patrol arrested one person after finding more than 240 pounds of cocaine during a commercial vehicle inspection.

On Tuesday afternoon, an NSP Carrier Enforcement trooper conducted a commercial vehicle inspection on a semi tractor/trailer driven by Arwinderjit Singh, 30, of California, near mile marker 254 on Interstate 80.

Arwinderjit Singh mugshot(Dawson County Jail)

During the inspection, the trooper became suspicious of criminal activity. An NSP K-9 detected the odor of a controlled substance inside the cab of the semi, troopers said.

After searching the cab, troopers located 242 pounds of cocaine concealed underneath the sleeper bed, NSP said.

Troopers with the Nebraska State Patrol arrested one person after finding more than 240 pounds... — Troopers with the Nebraska State Patrol arrested one person after finding more than 240 pounds of cocaine during a commercial vehicle inspection.(Nebraska State Patrol)

Singh was arrested on suspicion of possession of cocaine, possession with intent to deliver, possession of an open alcohol container, no drug tax stamp and displaying a fictitious license plate.

Singh was lodged in Dawson County Jail, and his bond was set at 10% of $2 million. A preliminary hearing is scheduled for March 12.

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Nebraska

Athlete of the Week: Creighton Prep boys wrestling’s Zaiyahn Ornelas

Published

14 hours ago

February 27, 2026

Press Room

Athlete of the Week: Creighton Prep boys wrestling’s Zaiyahn Ornelas

OMAHA, Neb. (WOWT) – Creighton Prep senior Zaiyahn Ornelas won his fourth consecutive Nebraska state wrestling title on Saturday.

According to NSAA records, he joins 39 other wrestlers in state history to accomplish the feat.

“It’s a great feeling,” Ornelas said. “It’s a feeling everybody wants.”

The senior ended his career as the 39th four-time state champion in Nebraska history, winning three at Wilber-Clatonia before joining the Jr. Jays.

Ornelas won three Class C state titles at Wilber-Clatonia at 106, 113 and 120 pounds before transferring to Creighton Prep for his senior season, where he competed in Class A at 126 pounds.

“Three state titles there and then just thought I could bump up my competition,” Ornelas said.

“Zaiyahn is one of the cleanest technicians I’ve ever seen. That’s a huge testament to his coaching staff at Wilber,” Fisher added.

Ornelas was one of four Creighton Prep wrestlers to win state titles this season, helping lead the Jr. Jays to the Class A team title. Teammates said his presence in the practice room raised their level of competition.

“I could never slack off just because my competition in the state was easy. I always had to come in this room and get better or else I was going to get beat,” said sophomore Cruzer Dominguez, a two-time Class A state champion at 106 and 120 pounds.

Sophomore Kameron Green, the Class A 144-pound state champion this year, also credited Ornelas for aiding in his development.

“Zaiyahn being a training partner has helped me in tremendous ways,” he said. “When he wrestles, he’s not the nicest or shyest kid, but he’s tenacious and tough.”

The sophomore won his first state title after finishing as a runner-up at 126 pounds as a freshman.

Junior JT Smith, a two-time state champion at 175 and 190 pounds, said the achievement carries weight for the entire team.

“It’s something really special to have a teammate that’s a four-time state champion,” he said. “That’s something everyone wants to be.”

The junior finished the season as a back-to-back state champion after winning a gold medal at 175 pounds as a sophomore.

Fisher said Ornelas’s attitude set the tone from the start.

“He has so many skills and then coming into our room, he’s extremely coachable. Every time he came in here he was humble, ready to work, wanting to get better and that’s why he is as good as he is,” Fisher said.

Ornelas signed to wrestle at the University of Nebraska in November. He said the move to Creighton Prep delivered what he was looking for.

“This is the reason why I came here. I went out to explore, to find the best, and this is the territory that I found. If it wasn’t for these guys — the push — I would have not been there,” Ornelas said.

“It’s hard to believe. That’s kind of what I wanted since the beginning, freshman year,” he said.

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Nebraska

Nebraska Chamber taps former state senator to lead during leadership transition

Published

1 day ago

February 26, 2026

Press Room

Nebraska Chamber taps former state senator to lead during leadership transition

LINCOLN, Neb. (KOLN) – The Nebraska Chamber of Commerce & Industry has selected a former state senator and longtime board member to lead the chamber while it searches for a new president and CEO.

Board of Directors Chair Pat Keenan said Thursday that Matt Williams of Gothenburg agreed to serve as interim president.

ALSO READ: Nebraska Chamber president and CEO resigns after less than a year

“The Board is grateful to Matt for stepping into this role during a very active and productive time for the Nebraska Chamber,” Keenan said. “He has steady leadership, strong relationships and trust from his many years of advocacy for economic development, and decades of experience working with the legislature and state government on tax policy and economic development incentives.”

Matt Williams(NE Chamber)

Williams represented District 36 in the Nebraska Legislature from 2015 to 2023.

The chamber said Williams has had a lifelong career in banking and serves as chairman of Flatwater Bank. He previously served as chair of the Nebraska Bankers Association and the American Bankers Association.

His long involvement with the chamber includes membership on the Board of Directors; he currently serves as director for District 6. In 2025, he was named to the Nebraska Business Hall of Fame.

“The Nebraska Chamber is on rock-solid footing, with the clear vision of the Board, and talented and hard-working staff hitting its stride in legislative policy and advocacy, technology, manufacturing, leadership-development, fund-raising and membership. The success of cutting-edge initiatives like 6 Regions, One Nebraska, the launch of the Go Big Future series, and the strong member engagement across the state demonstrate the success and strength of this organization. I’m excited to lend my support in whatever way I can for the Chamber. I know how strong businesses and communities make for a stronger Nebraska, and I’m glad to be part of that.”

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