More than $11 million worth of property may be seized after a seven-month long police operation targeting drug dealing houses across nine districts.

The operation has resulted in charges against 155 people.

Detective Inspector Craig Scott, from the National Crime Group, said the property likely to be seized included cash, six houses, and a number of commercial premises and vehicles.

He said it was of particular concern that 40 children, aged between 3 weeks and 16 years, were found in drug dealing houses across the country, he said.

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During the operation an officer was sold drugs by a woman who was carrying a young child in her arms.

In another incident, a woman was involved in the sale of methamphetamine to an undercover officer while breastfeeding her young baby.