A routine police checkpoint operation near Lumsden uncovered a "substantial" amount of cannabis after officers caught a whiff of the stuff in a car they stopped, prompting a search.
Police were working the operation on State Highway 94 on Friday checking for drink driving, lack of seatbelts, mobile phone use and other traffic offending.
Staff stopped a car which had driven from Gore and was heading toward Te Anau, police said.
They caught a strong smell of cannabis and invoked a 2012 Search & Surveillance Act of the vehicle.
Two large chilly bins were located on the rear seat of the vehicle and were found to contain 1kg of cannabis head and over $500 in cash.