A second person has been charged in relation to 25 kilograms of methylamphetamine that was found during a vehicle stop in Northam in June.
It is alleged the drugs were located hidden in various areas of a Toyota Hilux which was stopped on Great Eastern Highway.
The vehicle had two occupants and was travelling from NSW to WA.
It is alleged the search resulted in the seizure of about 25 kilograms of methylamphetamine, about 280 grams of cocaine, more than $10,000 in cash, a semi-automatic pistol and a quantity of ammunition.
A 36-year-old woman from New South Wales has been charged with possessing methylamphetamine with intent to sell or supply, possession of cocaine with intent to sell or supply, possessing a firearm and being an unlicensed person possessing a firearm and ammunition.
She is due to appear before the Perth Magistrates Court today, February, 8.
A 43-year-old man from Liverpool in NSW has previously charged regarding this incident.