Skip to main content

New technologies leading to criminal retrials in Japan

DNA testing has resulted in acquittals of some death-row inmates.
DNA testing has resulted in acquittals of some death-row inmates.
“In the world of engineering, when an airplane accident occurs, a thorough investigation is conducted. But what on earth are the people involved in laws doing when serious human error is committed in the cases of wrongful convictions?”

OSAKA — With the recent release of a couple from prison after a court ordered a 1995 arson-murder case reopened and other such retrials in Japan, more people previously convicted of serious crimes are getting a second shot at proving their innocence.

Technical innovations in DNA forensic science modeled on activities in the United States, as well as the introduction of a lay judge system, are creating a framework that could provide lawyers and “criminals” with access to various experts to help prove the innocence of persons suspected to have been wrongfully convicted.

But the road to change has many hurdles.

Recently, Keiko Aoki and Tatsuhiko Boku, who had been serving a life sentence for lighting a fire that killed the woman’s 11-year-old daughter, were freed after 20 years behind bars.

The Osaka High Court concluded that a retrial was appropriate as the fire could have been accidental, drawing on an experiment conducted by the couple’s lawyers to simulate the fire. Moreover, doubt was cast on the confession from Boku, the women’s de facto husband, as the simulation demonstrated the fire having caught in a different way.

In 1990, Toshikazu Sugaya was arrested and convicted with a life sentence by a high court in Tochigi Prefecture for the murder of a 4-year-old girl. It was determined that DNA evidence from body fluids on the dead girl’s clothing matched Sugaya’s.

But with the primitive forensic technology at the time of the man’s arrest, a little more than eight out of every 1,000 people would have also drawn an identical DNA match. Upon a further test in 2009, DNA evidence conclusively showed Sugaya’s innocence, and he was acquitted and awarded about 80 million yen in state compensation.

Perhaps even more sensational due to the international attention it gained was the case of Govinda Prasad Mainali, a Nepalese man who was wrongly jailed for 15 years while serving a life sentence in the 1997 murder of a Japanese female Tokyo Electric Power Co. worker who reportedly had moonlighted as a prostitute.

The Tokyo High Court ordered a retrial after sets of exculpatory DNA evidence were linked to an unidentified man who had sexual contact with the victim just hours before her death. Mainali was released and deported back to his native country, pending a retrial.

Swabs of semen recovered from the women’s body that the prosecution deemed too small a sample to analyze using the existing technologies at the time, underwent DNA testing in 2011 and were determined not to be from Mainali.

Mainali was formally acquitted in November 2012 and later awarded 68 million yen in compensation for his wrongful imprisonment.

Iwao Hakamada was exonerated by a DNA test after 48 years on death row.
Former professional boxer Iwao Hakamada, who had been sentenced to the death penalty in a 1966 quadruple homicide case, was released after nearly 48 years behind bars when a DNA test showed that blood stains detected on the culprit’s clothing did not belong to Hakamada.

The blood was thought to be that of the attacker and was previously determined unlikely to be from any of the victims.

In Japan, prosecutors have a staggering 99 percent conviction rate. Confessions are in most cases considered the king of evidence and acquittals are anathema to ambitious prosecutors and judges alike, experts argue.

Although it appears retrials in Japan could be on the rise, many point out that without “convincing and fresh” evidence the courts remain reluctant to order retrials. And even with fresh evidence, unless it can conclusively prove the person’s innocence, requests for retrials have historically been denied.

Inspired by the U.S.-based Innocence Project, researchers in Japan aim to launch a support network next spring for people believed to have been wrongly convicted.

Mitsuyuki Inaba, a professor at the College of Policy Science and Graduate School of Policy Science at Ritsumeikan University, is spearheading the project. He bemoans the lack of remorse expressed by investigators in wrongful conviction cases and says that more must be done to determine their cause.

“In the world of engineering, when an airplane accident occurs, a thorough investigation is conducted. But what on earth are the people involved in laws doing when serious human error is committed in the cases of wrongful convictions?” Inaba said.

The Innocence Project, which was founded in 1992 at the Benjamin N. Cardozo School of Law at Yeshiva University in New York City, serves as a nonprofit organization.

In questionable cases, scholars, journalists and lawyers work together to gather new evidence in response to prisoners who claim innocence. New technologies such as DNA testing and research of cases from fresh perspectives have resulted in retrials and acquittals of some death-row inmates.

Similar activities are spreading in countries like France, Australia and Taiwan, leading to a global network.

Kana Sasakura, an associate professor of the Konan University Faculty of Law in Kobe, said that Japanese courts will not allow a retrial unless new evidence is strong enough to overturn the original judgment. Moreover, collecting such evidence is extremely difficult.

“Unlike in ordinary criminal trials, there is no system for court-appointed defense lawyers, who are publicly financed, at retrials,” said Sasakura. “It is very difficult for convicts held in prisons and detention houses to collect new evidence by themselves that could overturn their conviction.”

“In the future, it would be desirable for the Japanese project to be operated like an NPO, raising donations from the public. For the time being, however, it will probably be operated more stably by having the head office at a university, which will be useful for education if students are interested in joining,” Sasakura said.

Source: Japan Times, November 2, 2015

- Report an error, an omission: deathpenaltynews@gmail.com - Follow us on Facebook and Twitter

Most viewed (Last 7 days)

Former Florida officer who raped, murdered 11-year-old set to be executed

An execution date has been set for a former Mascotte police officer who, in May 1987, assaulted and murdered an 11-year-old girl.  Gov. Ron DeSantis signed a death warrant for James Aren Duckett on Friday. He’s scheduled to be executed on March 31. It’ll be the state’s 5th execution this year, following a record 19 executions in 2025.  Duckett was convicted in the murder of 11-year-old Teresa McAbee about a year after her death. According to officials, Duckett took the 11-year-old to a lake, where he sexually battered, strangled and drowned her. 

Florida executes Billy Kearse

Florida executes man who killed Fort Pierce police officer during 1991 traffic stop Moments before receiving a lethal injection, Billy Kearse asked for forgiveness from the family of Danny Parrish, whose widow said she found peace after a "long, long 35 years.” A man convicted of fatally shooting a police officer with his own service weapon during a traffic stop was executed Tuesday evening, becoming the third person put to death by Florida this year after a record 19 executions in 2025.

Chinese courts conclude trials of 2 criminal gangs from northern Myanmar, 16 sentenced to death

Chinese courts have concluded the trials of 2 major criminal groups based in northern Myanmar involved in telecom and online fraud, the Supreme People's Court (SPC) said Thursday.  At a press conference held by the SPC, it was revealed that by the end of 2025, courts across the country had concluded first-instance trials of over 27,000 cases related to telecom fraud operations in northern Myanmar, with more than 41,000 returned suspects sentenced.  Notably, among the trials of the so-called "4 major families" criminal gangs -- which had drawn widespread domestic and international attention -- those of the Ming and Bai groups have completed all judicial proceedings.

Florida | Governor DeSantis signs death warrant in 2008 murder case

TALLAHASSEE, Fla. — Governor Ron DeSantis has signed a death warrant for Michael L. King, setting an execution date of March 17, 2026, at 6 p.m. King was convicted and sentenced to death for the 2008 kidnapping, sexual battery and murder of Denise Amber Lee, a 21-year-old North Port mother. On January 17, 2008, Michael Lee King abducted 21-year-old Denise Amber Lee from her North Port home by forcing her into his green Chevrolet Camaro. He drove her around while she was bound, including to his cousin's house to borrow tools like a shovel.  King took her to his home, where he sexually battered her, then placed her in the backseat of his car. Later that evening, he drove to a remote area, shot her in the face, and buried her nude body in a shallow grave. Her remains were discovered two days later. During the crime, multiple 9-1-1 calls were made, but communication breakdowns between emergency dispatch centers delayed the response.  The case drew national attention and prompted w...

Oklahoma Ends Indefinite Death Row Solitary Confinement

Every year, thousands of prisoners in the U.S. are placed in solitary confinement, where they endure isolation, abuse, and mental suffering . This practice might soon become rarer for some inmates in Oklahoma, thanks to the efforts of activists in the state. Earlier this month, the American Civil Liberties Union (ACLU) of Oklahoma announced that the Oklahoma State Penitentiary in McAlester had ended the practice of indefinite solitary confinement for "the vast majority" of death row prisoners.

‘Come on with it’: Arkansas inmate asks to hasten execution

A Faulkner County judge has scheduled an August hearing to determine whether a death row inmate can bypass his attorney’s advice, drop his remaining appeals, and hasten his execution.  Scotty Ray Gardner, 65, is facing the death penalty for the 2016 killing of his girlfriend, Susan Heather Stubbs, in Conway.  In letters sent to Circuit Judge Chuck Clawson and the Arkansas Democrat-Gazette, Gardner said he wants to end his legal battles, writing that he is tired of prison life and skeptical he will receive a fair hearing.  “It’s simple,” Gardner wrote in a September letter. “Come on with it.” 

Florida Cop-killer Billy Kearse set to be executed today

A man who confessed to fatally shooting Fort Pierce Police Officer Danny Parrish with his own service weapon during a 1991 traffic stop is scheduled to be executed starting at 6 p.m. March 3, barring a last-minute stay. Billy L. Kearse, 53, will be the third person put to death by the state this year, just one week after the execution of Melvin Trotter, who was convicted of first-degree murder and sentenced to death for strangling and stabbing Virgie Langford in Palmetto in 1986. The Florida Supreme Court on Feb. 12 denied a motion for a stay of execution and a motion for an extension due to the fading health and death of the father of Kearse's attorney. Attorneys for Kearse have filed a motion with the U.S. Supreme Court to stop the execution, citing violations of the Sixth, Eighth and 14th Amendments of the United States Constitution.

Man convicted in 1986 murder set to become Florida's second execution of 2026

STARKE, Fla. (DPN) — A man convicted of stabbing and strangling a grocery store owner during a robbery nearly 40 years ago is scheduled to die by lethal injection Tuesday evening, becoming the second person executed in Florida this year. Melvin Trotter, 65, is set to receive a three-drug lethal injection beginning at 6 p.m. at Florida State Prison near Starke. Trotter was convicted of first-degree murder in the 1986 killing of Virgie Langford, 70, who owned Langford’s Grocery Store in Palmetto, in southwest Florida's Manatee County.

Florida executes Melvin Trotter

The execution of Melvin Trotter for the murder of 70-year-old Virgie Langford in 1986 comes as Supreme Court Justice Sonia Sotomayor questions Florida's 'deeply troubling' lethal injection record. Florida has executed its second inmate of the year even as a Supreme Court justice questioned the state's “deeply troubling" record on lethal injections and how it "shrouds its executions in secrecy."  Melvin Trotter, 65, was executed by lethal injection on Tuesday, Feb. 24, for the 1986 murder of 70-year-old Virgie Langford, a mother of 4 who was on the verge of retirement when she was stabbed to death in the corner grocery store that she owned for five decades. Trotter was pronounced dead at 6:15 p.m. ET. 

Texas Plans Second Execution of the Year

Cedric Ricks is set to be killed on March 11 Cedric Ricks spoke in his own defense at his 2013 murder trial, something most defendants accused of a terrible crime do not do. Ricks confessed that he had killed his girlfriend, Roxann Sanchez, and her 8-year-old son. He admitted he was aggressive and had trouble controlling his anger, stating that he was “sorry about everything.” The Tarrant County jury was unmoved. Ricks has spent the last 13 years on death row and is scheduled to be executed on March 11.