A man tried to whistle a warning to his partner after he was arrested yesterday, but this only tipped police off that she was hiding in the house.
Acting Detective Senior Sergeant Shelley Begbie said police went to the property on Norrie St in the Hamilton suburb Bader in relation to shoplifting allegations.
They arrested a 36-year-old man who claimed he was the only person home, other than a young child who was taken to a neighbour's to be looked after.
As he walked down the driveway he tried to discard some cannabis into a rubbish bag but police saw him.
As a result he was told his home would be searched.
Ms Begbie said the man started whistling, telling officers he was calling his dog.
"This made the officers suspicious that there may be another person in the house and during the subsequent search we located 23 cannabis cigarettes, a quantity of cannabis plant material and the man's 35-year-old female partner," Ms Begbie said.
The pair where both charged with theft and inquiries were continuing into what charges they may face in relation to the drug offending.