A woman will appear in the Greymouth District Court today facing drug, weapons and driving charges.
Tasman District police say the 52 year-old from Rununga was arrested yesterday after a member of the public contacted the police with concerns about her driving south from Westport.
Police say she failed a drug impairment test.
She has been charged with driving while under the influence of drugs, possession of class A drugs, possession of methamphetamine and cannabis resin, possession for supply of LSD, and possession of an offensive weapon.