The coroner has ruled that the deaths of three members of the same family, and their shooter, could have been avoided.
An inquest has heard how a man who went on to kill three members of his family before turning the gun on himself had been warned by police.
The inquest into the deaths of a man who shot himself and three members of his family on New Years Day 2012 has been taking place today.
Michael Atherton shot his partner Susan, her sister Alison and 24-year-old niece Tanya before taking his own life at his home in Peterlee last year.
An inquest into their deaths began today and heard that a note had been attached to Atherton's request for a shotgun license in 2006 which said:
– Note attached to Atherton's firearm license application
"Four domestics, last one 24/4/04, was cautioned for assault.
"Still resides with partner and son and daughter.
"Would like to refuse, have we sufficient info to refuse re public safety."
However, Atherton was still granted a shotgun certificate then and a firearms licence two years later.
The inquest also heard that there was no formal training for police officers involved in the granting of firearms licences.
Witness B, who cannot be named, said:
– Witness B
"There was no formal training, I'm not aware of any formal training in firearm departments.
"Ninety percent of application forms were straightforward."
Evidence was also given by pathologist Dr Nigel Cooper who said Atherton had about one and half times the alcohol driving limit in his blood at the time, which was the equivalent to a few drinks.
Atherton had previously had his guns confiscated after threatening to shoot himself when drunk.
An inquest into the deaths of a cabbie who shot himself and three members of his family has heard there was no formal training for police officers involved in granting firearms licences.
Michael Atherton shot Susan McGoldrick, her sister Alison and niece Tanya, before killing himself last year.
The inquest also heard that one investigating officer at Durham Constabulary had never seen guidance by the Home Office or the Association of Chief Police Officers on issuing gun certificates.
Atherton legally owned six weapons, including three shotguns, despite having a history of domestic abuse.
Officers from Durham Police who gave evidence at Coroner's Office, Crook, County Durham, said there was no formal policy written down regarding firearms for them to use.
This led coroner Andrew Tweddle to describe the force's procedures as "more of an ad hoc arrangement".
An inquest into the death of a taxi driver who shot three members of the same family before turning the gun on himself is taking place.
Michael Atherton, killed his partner Susan McGoldrick, her sister Alison and niece Tanya, before taking his own life on New Year's Day 2012 at his home in Horden.
Atherton legally owned firearms despite a history of domestic violence.
He had his guns removed by police after he threatened to blow his own head off when drunk, but they were returned weeks later.
Alison Turnbull's son Bobby wants to tighten gun ownership legislation to stop further tragedies.
He has already won the backing of shadow home secretary Yvette Cooper after meeting her earlier this year.
Bobby is calling for changes to gun laws, including stricter checks of medical records, and hopes the coroner will make recommendations to the Home Secretary at the end of the hearing.
– Bobby Turnbull - victims' son, brother and nephew
"There's a lot of little questions I have that I want answering.
"I hope they will come out through the course of the inquest, which might put my mind at rest and help me to understand."
An inquest into the Horden shootings in County Durham is due to start today. On New Year's day last year Michael Atherton shot dead his partner as well as two other members of her family - before killing himself. The inquest will look into the circumstances surrounding the deaths.
A Coroner has heard that a father who killed himself and his 7 year old daughter in a house fire on Teesside, had actually intended to kill his entire family.
Philip Braithwaite had researched house fire methods on the internet before he carried out the attack on May Day last year.
Our Correspondent Rachel Bullock has the latest from the inquest.
A coroner says lessons must be learned after a mother killed her son whilst suffering serious mental health problems.
Melanie Ruddell from County Durham strangled 2 year old Christy. Her family and friends say their concern had fallen on deaf ears.
An inquest has heard that a mother was assessed as having 'acute psychosis' just hours before she killed her young son.
Melanie Ruddell was taken to hospital but discharged herself before she could be seen by a specialist mental health team. A short time later, Mrs Ruddell strangled 2 year old Christy.
Helen Ford has been at the inquest in Sunderland.