A North Queensland police constable has resigned after allegedly being caught with drugs at the Stereosonic Music Festival in Brisbane at the weekend.

The 26-year-old woman was one of about 130 people arrested on drug charges at the event held at the Brisbane showgrounds.

Ethical standards was investigating but Queensland Police said the woman had since quit the service.

• Big dollars riding on the festivals of death

• On-duty cops test positive to drugs

• ‘Staggering’: 20 overdoses at Brisbane Stereosonic

“The officer will not be subject of a disciplinary investigation concerning allegations of misconduct due to her resignation,” the statement said.

She is due to face the Brisbane Magistrates Court on January 5.

Event organisers went all out to ensure the festival’s Brisbane leg was safer after a 19-year-old man died in Adelaide and a 25-year-old woman died in Sydney from an overdose.

Extra ambulance officers and security staff were hired to supervise patrons, but ambulance officials said the measures did not stop people taking drugs.

Over the weekend, paramedics took 20 people to Brisbane emergency departments for treatment for drug overdoses.