Police intercepted a vehicle in Castlemaine about 1.40am on Monday and allegedly found about 40 grams of a white crystal substance believed to be methylamphetamine.

Police allege the drugs have an estimated street value of about $28,000.

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A 37-year-old Flora Hill woman was arrested and charged with a number of drug related offences, including trafficking a drug of dependence.

She was bailed to appear at the Castlemaine Magistrates' Court on October 30.

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