It puzzles me how proponents of the legalisation of euthanasia can confidently claim that in the Netherlands and Belgium, the two jurisdictions with the longest experience of legalised euthanasia, there have been no slippery slopes.
The evidence is clearly otherwise.
The “logical slippery slope” occurs when the legalisation of euthanasia for a very limited group of people in very limited circumstances is expanded to include more people in more situations. This has been described as “scope creep”.
The “practical slippery slope” occurs when euthanasia is carried out in breach of the legal requirements as to either who may have access or the situations in which they must find themselves for euthanasia to be permissible.