He and his childhood friend Razali bin Mat Zin were both arrested in Singapore for two separate charges of trafficking 1.04 kg of marijuana (or cannabis) and 943.3g of the same substance, as a result of an undercover operation facilitated by the Central Narcotics Bureau (CNB).

[3] Born in 1971 at the Malaysian state of Kelantan, Rozman bin Jusoh grew up with one eldest brother and four other siblings in an ethnic Malay family living at Kampung Semerak, Pasir Mas.

The officer, Tan Keng Ann, was ordered to arrange the meet-up with Rozman after the narcotics police received a tip-off on 23 November that a man was selling marijuana at a shopping mall at Upper Bukit Timah.

The next day, with the help of Razali, who escorted him on a motorcycle, Rozman arrived at the KFC fried chicken restaurant at an Upper Bukit Timah shopping centre, and meet up with Tan as per the arranged timing.

It was further revealed that Rozman may be easily prone to manipulation of others, which could have affected him into selling the drugs to the undercover officer Tan Keng Ann.

Justice Rubin also stated that based on these factors, which he viewed as unopposed by the prosecution, as well as the entrapment evidence obtained from the undercover operation, it would be unsafe to convict Rozman of these two charges of drug trafficking and subject him to the mandatory sentence of death.

28-year-old Razali bin Mat Zin was fully acquitted of both charges, although he still remained in remand pending the prosecution's appeal against the trial decision.

[19][20][21] Therefore, the three-judge panel allowed the prosecution's appeal, and found 24-year-old Rozman bin Jusoh guilty of the two original drug charges.

[26] At the same timing, Rozman's 29-year-old accomplice Razali bin Mat Zin and a 35-year-old Singaporean hawker assistant Neo Kay Liang (convicted of trafficking 20.19g of heroin) also executed at the same prison.

It was cited among the discussions about the possible impacts that may come with the discretion to decide on the sentence for drug traffickers with low intelligence, which may have allowed their lives be spared.

[34] In the aftermath, the new laws took effect in January 2013, and it allowed the imposition of life imprisonment (with or without caning) for drug traffickers who either only acted as couriers or suffered from disabilities that impaired their mental responsibility for the crime, as well as for murderers who had no substantial intention to cause death.

[35] Rozman's case was recalled in November 2021 when Singapore faced international attention for controversially scheduling the execution of Nagaenthran K. Dharmalingam, a Malaysian who allegedly had borderline intelligence and mental disabilities.

[36] The Singapore government, courts and psychiatrists had expressed that Nagaenthran was not intellectually or mentally disabled when he committed the crime of smuggling 42.72 grams of diamorphine.

[39] Alan Shadrake, a British journalist, wrote about Rozman's case in his book Once A Jolly Hangman: Singapore Justice in the Dock, which was first published in 2010.

[41][42] Shadrake, who refused to show remorse for his crime, lost his appeal and later released by parole on 9 July 2011 after serving two-thirds of his sentence with good behaviour.