I have posted on this previously in another tthread, but thought it may be clearer to start a new one.
A certain FOI request received a response:
https://www.whatdotheyknow.com/request/evidence_regarding_liability_law#incoming-437451
Make of it what you will.
To me the 'research' conducted by officials seems a textbook example of how to give the appearance of answering the question, while in fact failing to answer it.
If this is how 'evidence based' policy works in Scotland, then we really are off to Hell in a hand cart!