Lisa Martin, a former care home worker who alerted police to failing at the Orchid View care home in Copthorne, said she the "final straw" for her came when she was told by a nurse that 28 drug errors had been made on just one night shift.
She called police who arrived the next day.
The coroner said 19 residents at Orchid View suffered "sub-optimal" care. All of those residents died from natural causes, she ruled. But five of those died from natural causes "which had been attributed to by neglect", Ms Schofield ruled.
They were Wilfred Gardner, 85, Margaret Tucker, 77, Enid Trodden, 86, John Holmes, 85, and Jean Halfpenny, 77.
More top news
A female motorcyclist who hates litter bugs seems to have taken drastic action to make people stop dropping rubbish on the streets in Russia
You can buy just about anything on Alibaba, including some very unusual items.
Firefighters across California have been battling major wildfires in what could be the most destructive wildfire season on record.