Background: Organ donation in Scotlandpublished at 15:53 Greenwich Mean Time 26 February 2019
The Human Tissue (Authorisation) (Scotland) Bill, external follows similar legislation passed in Wales in 2015, and allows parts of an adult's body to be used in transplants in the absence of express permission.
However, it includes provisions to make sure the wishes of families and next of kin continue to be respected, and excludes children and adults who do not have the capacity to understand the rules.
MSPs considered an opt-out system in the previous parliamentary term, but narrowly rejected a member's bill from Labour's Anne McTaggart due to "serious concerns" about the "practical impact of the specific details".
Ministers promised to consider the idea, and have brought forward their own legislation with the backing of British Medical Association Scotland and 82% of respondents in a consultation.
There have been calls for other parts of the UK to follow the Welsh model, and MPs have backed making a similar change in England.
A study of the Welsh system found that it had not increased the number of donors across its first two years, although Health Secretary Vaughan Gething said it was "too early to know the true impact" of the change.