Warnings consultants might be slipping bias into Government.

The core public service spent $1.2 billion dollars on contractors and consultants for the 2021 to 2022 financial year.

A political analyst says big consultancy firms are advising Government, but also have commercial clients.

Victoria University's Bryce Edwards says we can't trust they're playing with a straight bat.

"In the health sector for example, Deloitte's been used a lot more by the Ministry of Health, but they also have health technology clients and these things aren't declared."

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