Day: October 2, 2026

The short answer is 1 April 1937, when the Dangerous Drugs Act 1934 came into force. But that answer is misleading on its own, because nothing much happened on that date. No raids, no seizures, no headlines. Cannabis didn’t become illegal in Ireland so much as it was gradually paperworked out of existence, over roughly fifty years, by a process that started in Geneva and ended with a plant most Irish doctors had simply stopped thinking about. Here is how it actually happened. Before the Law: Cannabis as an Ordinary Irish Medicine To understand the prohibition, you have to understand what was being prohibited. In 1839, a Limerick-born doctor named William Brooke O’Shaughnessy published research from Calcutta describing the first systematic Western clinical trials of cannabis. His work travelled fast. By 1845, Michael Donovan of the Apothecaries’ Hall in Dublin had published on Indian hemp in the Dublin Journal of Medical Science, with cases contributed by Abraham Colles and Sir Dominic Corrigan — about as establishment as Irish medicine got. Sir Dominic Corrigan published on it in the same year. Fleetwood Churchill followed in 1849. From the journals it moved into ordinary practice. Cannabis tinctures became a normal dispensary item in Irish and British pharmacies through the second half of the nineteenth century and into the twentieth. We know this partly from the law itself. When the Irish Free State wrote regulations in 1937, the title of the statutory instrument was the Dangerous Drugs (Medicinal Opium, Tincture of Indian Hemp, Morphine, Cocaine, Etc.) Regulations, 1937. Governments do not write detailed dispensing rules for medicines nobody stocks. 1925: Geneva, and Why Cannabis Was on the Agenda at All International drug control in the 1920s was about opium. Cannabis was an afterthought — and very nearly not on the agenda at all. At the Second International Opium Conference, held in Geneva and signed on 19 February 1925, Egypt’s delegate pressed for cannabis to be included, arguing it was at least as harmful as opium. Other delegations supported him. Britain, with an empire full of cannabis-using populations and a Royal Commission on its shelf that had advised against prohibition, objected on procedural grounds. Cannabis went in anyway, under the name “Indian hemp,” defined as the dried flowering or fruiting tops of the female plant. The Irish Free State was three years old and had a delegate in the room: Michael MacWhite, Ireland’s permanent representative to the League of Nations. His own memorandum of 17 March 1925 describes League members voting against Britain at the opium conference. The newly independent state was present at the moment cannabis entered the international control system, and it was not voting with London. A note on what we can and can’t confirm: Ireland is often said to have ratified the 1925 Convention in 1931. We were unable to verify that date. British parliamentary records from early 1930 still listed the Irish Free State among signatories whose ratification had not yet been completed, so the timing remains unsettled. 1934–1937: The Act That Didn’t Ban It The Dangerous Drugs Act 1934 was enacted on 2 February 1934 and commenced on 1 April 1937, under a commencement order made that year. It replaced the British Dangerous Drugs Act 1920 as it had applied in the Free State, and brought Irish law into line with the Geneva obligations. What it actually did is more specific than most summaries suggest. Part II controlled raw opium, coca leaves, and “Indian hemp and resins obtained from Indian hemp and all preparations of which such resins form the base.” Import, export and dealing in those were restricted. Part IV dealt separately with medicinal preparations, including extracts and tinctures of Indian hemp. These were regulated, not banned. Pharmacists could still dispense them, under record-keeping and prescription rules. So on 1 April 1937, a pharmacist in Cork did not have to destroy anything. They had to keep better records. This is the part most accounts get wrong. People reach for a dramatic moment of prohibition, and there isn’t one. What there is instead is a slow tightening: international obligations, then domestic regulation, then the gradual disappearance of the medicine from pharmacopoeias and prescribing habits as newer drugs arrived and the regulatory friction grew. By the time anyone thought to ask where cannabis medicine had gone, it had been gone for years. 1977: The Misuse of Drugs Act The modern framework is the Misuse of Drugs Act 1977, which replaced the 1934 Act and remains the governing legislation today, as amended. Under it, the detail lives in regulations and orders that can be updated without new primary legislation. The current ones are the Misuse of Drugs Regulations 2017 (S.I. 173/2017) and the Misuse of Drugs (Designation) Order 2017 (S.I. 174/2017). Schedule 1 of the Designation Order — the most restricted tier, for substances with no recognised medicinal use outside licensed research — lists, among others: A 2021 amendment (S.I. 121/2021) narrowed the cannabinol derivatives entry to exclude dronabinol and its stereoisomers, reflecting the use of synthetic THC in licensed medicines. Making, supplying or possessing a Schedule 1 substance is lawful in Ireland only under licence from the Minister for Health. Where the Law Stands Today Three separate things are often confused. They are governed differently. Cannabis itself Still a controlled drug under the 1977 Act and the 2017 regulations. Possession remains an offence. Medical cannabis Two routes exist. The Medical Cannabis Access Programme (MCAP) was signed into regulations by Minister for Health Simon Harris on 26 June 2019 as a five-year pilot. It covers three conditions: spasticity associated with multiple sclerosis, intractable nausea and vomiting associated with chemotherapy, and severe treatment-resistant epilepsy. Only consultants can prescribe. Separately, the Minister for Health can grant individual licences for patients outside those categories. This is the route that Vera Twomey’s long campaign eventually secured for her daughter Ava Barry in November 2017. Uptake under MCAP has been very low. In a parliamentary reply in March 2026, the Minister confirmed that 74

Search for the history of hemp in Ireland and you’ll find the same story told again and again. An ancient Celtic crop. Druids and bronze age fields. A plant woven into Irish life since before Christianity arrived. It’s a good story. The evidence doesn’t support it. What the evidence does support is stranger and, we’d argue, more interesting: hemp seems to have arrived in Ireland with Christian monasteries, somewhere around the eighth century. The men who first grew it here were most likely monks. The Word That Gives It Away Start with language, because language is unusually honest about this kind of thing. The Irish word for hemp is cnáib. It is not an old Irish word. It is a loanword, borrowed from Clerical Latin — from canapis or canabus — and it arrived with the Church. We can be fairly precise about when it shows up. In a 2024 review published in Cannabis and Cannabinoid Research, John McPartland and Saoirse O’Sullivan traced the word’s first appearances in Irish texts to manuscripts written in 1060 and between 1127 and 1134. Before that, nothing. The word is absent from the Old Irish glossaries, and absent from the epics and mythologies composed between roughly 600 and 900 CE. This matters more than it might seem. Irish is a language with deep roots and a long memory. It has inherited words for the plants and animals that mattered to the people who spoke it — for oak, for apple, for salmon, for cattle. If hemp had been grown and used in Ireland for centuries before Christianity, there would almost certainly be an inherited Irish word for it. There isn’t. And the pattern holds across the Celtic languages. As the researchers put it, words for hemp in Celtic languages are loanwords, not cognates. Every one of them was borrowed from somewhere else. What the Bogs Remember The second line of evidence comes from pollen. Irish bogs and lake beds are remarkable archives. Pollen settles, gets buried, and sits there in datable layers for thousands of years. Core down through a bog and you are reading a record of what grew nearby, century by century. In Irish cores, pollen consistent with cultivated cannabis begins appearing around 700 CE. Not before. And it appears in a telling pattern — in the vicinity of monastic sites. McPartland and O’Sullivan concluded that the onset of hemp cultivation correlated, both in time and in place, with the founding of Romano-British monasteries in Ireland. A note on precision here, because it matters. Cannabis pollen is genuinely difficult to distinguish from hop pollen under a microscope — the two plants are closely related and their grains look much alike. Researchers use indirect methods to tell them apart, which is why the careful phrasing is “pollen consistent with cultivated cannabis” rather than “cannabis pollen.” The correlation with monasteries is a correlation, not a signed confession. It is strong evidence. It is not proof of who first put seed in Irish soil. The Things People Actually Dug Up Then there is the archaeology: the physical hemp, as opposed to its pollen or its name. Hemp seeds and fibre have been recovered from Irish excavations — but from Norse-Viking and Anglo-Norman sites, which is to say from the tenth century onward. Not from Iron Age settlements. Not from the world of the Táin. Put the three strands together and they point the same way. The word arrives with the Church. The pollen arrives around 700 CE beside monasteries. The physical remains arrive later still, in Viking and Norman towns. Not druids. Monks. Why Monks? It makes practical sense once you picture it. Early Irish monasteries were not just prayer houses. They were farms, workshops, schools and centres of administration — among the most organised economic units in the country. They had land, labour and a reason to produce their own materials rather than buy them. Hemp is a fibre crop. It makes rope, cord, netting and coarse cloth. A monastery with boats, livestock, building projects and a scriptorium had constant use for all of those. These communities were also connected to a wider Latin-speaking European network, which is exactly how a new crop and its Latin name would travel together. One honest caveat: we have no evidence that Irish monks used hemp as a medicine. References to hemp in Irish folk medicine are, in the words of one researcher, difficult to document. The one early medicinal mention sometimes cited — a hemp salve — comes from the Lacnunga, a tenth-century Anglo-Saxon text, not an Irish one. In Ireland, as far as the record goes, this was a fibre crop. The Junior Partner Hemp never became a major Irish crop, and the reason is a familiar one: flax. Irish agriculture backed linen, and backed it hard. When the Huguenot expert Louis Crommelin published An Essay towards the Improving of the Hempen and Flaxen Manufactures in the Kingdom of Ireland in Dublin in 1705, hemp was in the title — but linen was what followed. The Irish Linen Board was established in 1711, bounties were paid, and Ulster linen went on to become world-famous. Hemp stayed in the margins. That didn’t stop people arguing for it. Bishop George Berkeley, in The Querist in the 1730s, asked whether enterprising people might not raise hemp in the counties of Clare and Limerick — land he thought as fit for the purpose as any in the world. In 1816, Peter Besnard reported that a hemp sample grown at Bunratty, Co. Clare possessed all the qualities of the Italian. And in 1866, a Tyrone-born physician named George Sigerson published a pamphlet in Dublin called Cannabiculture in Ireland: Its Profit and Possibility, making an economic case for hemp as an Irish crop — jobs, exports, and a reason for people to stay rather than emigrate. One correction worth making while we’re here. You will often read that Tudor law forced Irish farmers to grow hemp. The statutes usually cited —