What has changed in the year since cannabis possession was legalised in the ACT? SatSaturday 30 updated SatSaturday 30 JanJanuary 2021 at 9:55pm Cannabis use was legalised in the ACT one year ago, but cannabis usage rates have remained mostly steady. ( Share Print text only Cancel Key points: Passed a year ago, the ACT's laws allow possession of up to 50 grams of cannabis per person Cannabis offences have dropped by 90 per cent in the last 12 months ACT Health data shows there has been no increase in hospital presentations since the laws passed But one year on, cannabis users and stakeholders alike say that, while overall the impacts have been subtle, the change has been for the better.