The Children First Act would allow social agencies, schools and police to swap information to better care for youngsters in need.
Privacy Commissioner Jill Clayton says that opens up a host of concerns.
Clayton says such a law could erode people's right to control the spread of their own personal information.
She says those involved would not know who is collecting information about them or for what purpose.
Clayton also worries that information could be shared with non-profit groups that operate with little to no oversight over privacy.
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