The family have now also made complaints over the conduct of head of major crime, Det Ch Supt Paul Livingstone.
The family said: “As a family, we have welcomed some of the conclusions by Police Scotland’s Professional Standards Department (PSD) and the Police Investigations and Review Commissioner, with the former upholding one complaint against DCS Livingstone.
“Despite awaiting the outcome of upcoming disciplinary proceedings, DCS Livingstone remains in his job and is not even suspended.
“That he continues to have oversight of every murder inquiry in Scotland, including Alistair’s, is a completely unacceptable situation – particularly given his integrity has been questioned.”
The family statement added: “The poor judgement and lack of accountability at the highest levels of Police Scotland has regrettably eroded any trust we have in their ability to secure justice for Alistair.
“Our loyalty to and cooperation with Police Scotland has long been taken for granted during a sometimes turbulent relationship that the actions of senior leadership has damaged beyond repair.”
The family also said that their request to meet with Chief Constable Jo Farrell had been refused.
