Abuse of the work visa scheme appears to have increased in recent times.

RNZ is reporting nearly 200 employers have had their licence to hire migrants revoked or suspended as an investigation into migrant exploitation continues.

NZ Immigration Law's Aaron Martin told Mike Hosking that in his experience, the situation has worsened since the Accredited Employer Work Visa system started.

He says the way the system has run has allowed for people to game it and basically turn job offers into a commodity.

The Government says it's working to address both visa scheme abuse and immigration processing issues.

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