A 48-year-old man has admitted extortion and breach of the peace after he claimed to have poisoned products at a biscuit factory in Glasgow.
United Biscuits owns the McVitie's factory in Glasgow's east end
John McCulloch sent a letter to his bosses at McVitie's last June in which he said he had put weed killer, glass and a dead rat in the production line.
Police were called to the United Biscuits plant but no products were found to be contaminated.
McCulloch will be sentenced next month at Glasgow Sheriff Court.
In the letter, McCulloch, who had worked at the factory for 23 years, claimed he was sick of "bullying" by managers and it was "not a hoax".
The threat sparked a major search at the factory in Clydeford Street, Tollcross. Weedkiller was found but none of the products were affected.
It emerged during proceedings that McCulloch, of Burntbroom Gardens, Baillieston, had made a threat on a previous occasion in 2004. No poisoning was found and the matter was dealt with internally.
Sheriff Charles McFarlane deferred sentence on McCulloch, who is married with two children, until next month as he awaits reports.
A spokesman for the company said: "United Biscuits can confirm that, as a responsible food manufacturer, we took this issue very seriously.
"We acted swiftly and worked closely with the police and the Food Standards Agency to ensure there was never any danger to the public."