Possession of small amounts of marijuana for personal use has been decriminalised in Jamaica after a drugs law that was passed on Friday was debated by senators for five hours.

Having up to two ounces (around 56 grams) will only be punishable by a fixed penalty ticket, instead of a criminal charge.

The amendment of the law happens to have been passed on the birthday of reggae legend Bob Marley, who died of cancer aged 36 in 1981. He is well-known to have praised weed as “the healing of a nation.”

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The new penalty will cost, or if it would be a criminal offence to not pay the amount, is not yet known.

The old Dangerous Drugs Act stipulated that possession of cannabis carried a sentence up to five years and a penalty fine of up to $100 (around £57) per ounce, or up to three years in prison and a fine.

Senator Marlene Malahoo Forte had described the new legislation, piloted by Justice Minister Senator Mark Golding, as “very, very badly drafted, and incomplete” due to uncertainties regarding new penalty fine consequences.

The new legislation will also pave the way for a scheme of licences and authorisations for medical, therapeutic and scientific purposes, The Jamaica Gleaner reports.

The previous law was not always fully implemented in practice on small-time smokers, however a criminal record showing convictions can make it extremely difficult for Jamaicans to secure visas for the US or to land jobs at home, The Economist reports.

Pressure grew on the Caribbean island to decriminalise the possession and smoking of cannabis, officially referred to as ganja by Jamaican law-makers and residents, after some states in the US made it legal to use for medicinal purposes with a licence.

Importing, exporting, selling and growing marijuana carries much harsher criminal convictions and sentences.

Senator Keith Desmond Knight had taken issue with Clause 7 in the bill, which allows the minister to authorise any Rastafarian person to grow marijuana on designated lands, The Jamaica Gleaner reports.

A variety of medical marijuana strains in a dispensary in Denver, Colorado (REUTERS/Rick Wilking)

According to the newspaper, he questioned the exclusivity of rights allocated to followers of religion by saying: “Why is the cultivation of ganja limited to someone of the Rastafarian faith?”

Opposition Senator Robert Montague said that the legislation gives the minister too much power to determine who is allowed to cultivate and use cannabis.

According to The Jamaica Observer, he said: “The minister is setting up himself to be the pope of rastas, not the hope.”

The passing of the amended Dangerous Drugs Act will not impact negatively on any international treaty that Jamaica has signed, said foreign business minister Arnold Nicholson, who also has responsibility as foreign affairs minister.