A police force launched a disciplinary probe after catching one of its staff members at a huge illegal lockdown rave.
The Greater Manchester Police (GMP) worker was found to have visited the 4,000-strong bash at Daisy Nook Country Park in the summer.
An gross misconduct investigation was then launched by top brass after the breach, reports the Manchester Evening News (MEN).
But the woman resigned before a hearing took place on December 15 last year.
Around 4,000 people attended the self-styled 'quarantine rave' in a field near the park in Failsworth on June 13.
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One man died of a suspected drugs overdose.
Police put significant resources into stamping out a series of illegal lockdown raves during the summer, including at Daisy Nook Country Park.
Three people were stabbed and one young woman was raped at another lockdown rave at Carrington on the same night, an event attended by up to 2,000 and described as 'wild' by senior police.
The following week about 200 people attended another lockdown event in a car park off Caythorpe Street in Moss Side which ended with two people being shot dead.
A disciplinary panel decided the GMP employee who attended the Daisy Nook event - a civilian worker and not a police officer - would have been allowed to stay in the force with a 'final written warning' had they still been employed.
Brief details of the case emerged on a recently-published list of 'disciplinary outcomes' which are posted periodically on the force's website.
Neither the name nor the sex of the member of staff were revealed in the document but it was understood to be a female employee and the breach was uncovered some time later, reports the MEN.
