Singapore (CNN) โ Though he is provided with a straw mat, Matthew says he prefers to sleep on the concrete floor of his cell in the maximum-security wing of Singaporeโs Changi Prison.
โItโs more cooling that way,โ says the 41-year-old former schoolteacher, who was sentenced to more than seven years in prison and seven strokes of the cane for selling methamphetamine.
CNN met Matthew, who spoke on condition that his last name be withheld, during an exclusive tour of Changi Prison provided by Singapore authorities as they defended the city-stateโs uncompromising position on drugs.

In recent years, dozens of US states and countries ranging from Canada to Portugal have decriminalized marijuana.
But Singapore imposes a mandatory death penalty for people convicted of supplying certain amounts of illicit drugs โ 15 grams (half an ounce) of heroin, 30 grams of cocaine, 250 grams of methamphetamine and 500 grams of cannabis.
A 64-year-old man was hanged for drug offenses this week โ the fourth person to be hanged so far this year.
The harsh sentencing puts the wealthy city-state in a small club of countries that includes Iran, North Korea and Saudi Arabia, which execute criminals convicted of drug offenses.

K Shanmugam, Singaporeโs Minister for Home Affairs and Law, characterizes the countryโs war on drugs as an โexistential battle,โ and claims any easing of the governmentโs hardline stance could lead to chaos.
โLook around the world,โ Shanmugam says. โAny time there has been a certain laxity in the approach to drugs, homicides go up. Killings, torture, kidnappings โฆ that goes up.โ
A lucrative drugs market
Visitors to Singapore get a stark warning about the islandโs zero tolerance for drugs as international flights descend for landing.

โDrug trafficking may be punishable by death,โ a womanโs voice announces over the loudspeaker, amid instructions to passengers to buckle seat belts and stow away tray tables.
Many citizens of this Southeast Asian city-state are also aware that it is illegal for them to consume drugs overseas.
Returning Singaporeans and permanent residents run the risk of facing drug tests upon arrival.
โWhen you come back, and if there is a reason to believe you have taken drugs, you could be tested,โ Shanmugam says.
Per capita, Singapore is one of the worldโs wealthiest countries. With a population of nearly 6 million people, it has an annual GDP per capita of nearly $134,000.
This regional transport and financial hub has a reputation for safety, efficiency and strictness under de facto single-party rule.
The Peopleโs Action Party, of which Shanmugam is a member, has governed Singapore since its independence nearly six decades ago.
Speaking from a balcony in the Home Affairs Ministry overlooking tidy neighborhoods of parks and villas, Shanmugam argues his country is a potentially lucrative market in a part of Asia he says is awash with drugs.
โIf you are able to traffic into Singapore, the street price here compared to the street price in some other parts [of the world], itโs a magnet.โ
Singapore stands in relatively close proximity to the notorious Golden Triangle, the mountainous intersection of Thailand, Laos and civil war-torn Myanmar. Last year, the United Nations Office on Drugs and Crime (UNODC) labeled the region the worldโs largest source of opium. Production of methamphetamine in the region has also surged in recent years, outpacing heroin and opium.
Singaporeโs anti-drug czar claims strict punishment serves as a deterrent to drug traffickers.
โOur philosophy on prisons is not the same as, say, the Scandinavian philosophy,โ Shanmugam says. โWe choose to make it harsh,โ he adds. โIt is not a holiday home.
โIt is intended to be tough.โ
Single cells in stifling heat
Singaporeโs Changi Prison Complex is a walled compound of guard towers and imposing gates built in the shadow of the countryโs main airport.
More than 10,000 prisoners are held here, and according to the prisonโs latest annual report, most are serving time for drug offenses.
CNN was given access to one floor of a maximum-security wing that holds around 160 prisoners jailed for felonies ranging from drug dealing to violent crimes including manslaughter.
A network of security cameras mounted inside and outside individual cells and even over toilets allow just five guards to monitor the entire floor.
At mealtimes, the metallic clang of shutting gates echoes through the cell block, as a prisoner distributes meal trays through a ground-level hatch at the bottom of each cell door.
Authorities allowed CNN to interview only one prisoner, Matthew, the former schoolteacher, who said he was addicted to the same drug he was selling.
His single-occupancy cell is austere, measuring just 7 square meters (75 square feet), with a squat toilet beneath a shower. Inmates are not allowed to have furniture, so thereโs no bed or anything to sit on.
It is also steam-bath hot year-round in Singaporeโs tropical climate, where maximum daily temperatures regularly rise above 30 degrees Celsius (86 Fahrenheit).
The effect of extreme heat on prisoners has become more of a concern around the world as temperatures rise due to climate change.
โYou will notice that there arenโt any fans or aircon,โ Matthew explains. โThere are some periods of time where itโs unbearable.โ
Asked whether the threat of the death penalty had any deterrent effect on his drug dealing, Matthew says, โI would like to say yes.โ
โBut the truth is at that point in time I wasnโt thinking about it. In fact, I was actively avoiding the whole issue of consequences.โ
โCaptains of livesโ
The prisonโs deliberately harsh conditions contrast sharply with abundant emotional wellness messaging in the facilityโs common areas.
The workshop, where prisoners pack anti-dandruff shampoo and instant coffee for a small salary, is plastered with motivational quotes from luminaries such as Steve Jobs and Nelson Mandela.
Cartoon characters and photos of waterfalls decorate classrooms where prisoners get lessons in anger management and job training.
Officials from the Singapore Prison Service say they encourage guards to think of themselves as โCaptains of Lives,โ helping rehabilitate the prison population.
From an air-conditioned room known as โthe fish tank,โ they monitor inmates on live feeds from dozens of security cameras positioned around the prison.
Reuben Leong, the officer in charge of the correctional unit, says the job is not without risk. Violent incidents โ usually fights between inmates โ take place every few weeks, he says.
โThere will be periods of time where they can be demanding, they can be rude, they can be hostile to you,โ he adds.
The Yellow Ribbon Project is a government program aimed at rehabilitating former convicts, with job placement and community engagement.
Despite these efforts, Singaporean officials say roughly one in five former prisoners will likely end up back behind bars within two years. By comparison, one in three return to prison within two years in the United States, which has some of the highest recidivism rates in the world.
Meanwhile, there is no rehabilitation for death row inmates.
Singapore executed 11 prisoners by hanging in 2022, and five last year, according to the latest figures. All were convicted of drug charges.
Officials did not allow CNN to visit Institution A1, where more than 40 death row inmates await the same fate.
โGive my son a second chanceโ
Outside the prison walls, relatives of death row inmates hold an agonizing vigil awaiting the fate of their loved ones.
Halinda binte Ismail has a shock of bleach blond hair and sports a small stud in her left nostril.
By her count, the 61-year-old has been in prison at least seven times, always for drugs. Halinda says she was just 12 when she first smoked heroin.
Her last arrest was in 2017, when police raided the building where she lived with her eldest son, Muhammed Izwan bin Borhan.
Both mother and son were convicted for narcotics. But while Halinda ended up serving five years, her son was sentenced to death after police caught him with six packets of meth and heroin, according to court documents. He is still in prison, awaiting execution.
โIโm very angry with why the government doesnโt give [my son] a chance to change his life,โ Halinda says.
โI always pray to the government โgive my son a second chance.โโ
Halinda is now part of a small movement of activists seeking to ban Singaporeโs death penalty.
โItโs not solving anything, and itโs just disproportionately used against some of the most marginalized and weakest people in society,โ says Kirsten Han, a journalist and activist with the Transformative Justice Collective, who lobbies on behalf of death row inmates.
โI just feel like itโs very morally wrong.โ
Hanโs outspoken criticism of Singaporeโs system of executions has won her the personal enmity of Shanmugam, the Home Affairs minister.
โShe is one of those who romanticizes the people on death row,โ Shanmugam tells CNN.
However, Shanmugam confirms one of Hanโs observations.
Among more than 40 inmates he says are currently on death row, most are in the โlower social-economic category.โ
One of the 11 prisoners executed in 2022 for drug offenses was Nazeri bin Lajim.
โI was hoping that they [would] give him the life sentence, but they literally hanged my brother,โ says his surviving sister Nazira.
Nazira says her brother was a life-long drug addict, but not a violent man.
She shows a series of portraits in her phone of Nazeri, dressed in a brightly printed T-shirt, smiling and holding up a victory sign for the camera.
Before each execution, authorities organize a professional photo shoot in which inmates trade their prison uniforms for civilian clothes.
Nazira doesnโt appreciate the gesture.
โItโs fake happiness,โ she says.
She says she is encouraging her adult children to leave Singapore permanently to emigrate to Australia.
War on drugs
Singaporean officials point to surveys that show overwhelming public support for the governmentโs war on drugs.
In public appearances, Shanmugam often highlights public drug use on the streets of European and American cities to justify Singaporeโs approach to the problem.
But it may be more fitting to compare Singaporeโs record with Hong Kong, another former British colony that has a zero-tolerance approach to drugs.
Hong Kongโs population is around 25% larger than Singaporeโs, and it does not impose the death penalty for drug offenses.
Yet despite its considerably larger population, Hong Kong made 3,406 drug arrests in 2023 โ just a few hundred more than the 3,101 drug arrests in Singapore.
And according to Shanmugam, drug arrests in Singapore surged 10% in 2023 โ suggesting that perhaps the threat of death is failing to act as a deterrent to crime.
โItโs a fight that you never say youโve won,โ Shanmugam says.
โItโs a continuous work in progress.โ
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