A warning has come for caution before any change to the law giving a right to silence.

Police believe 14-month-old Sofia Taueki-Jackson was killed at her mother's home in Clover Park two years ago, after a significant head injury.

NZME’s newsroom can reveal a charge has been dropped against a family member accused of obstructing justice by refusing to assist the investigation.

AUT law professor Kris Gledhill told Kerre Woodham we need to question whether law should be based on an emotional situation like a child's death.

“Is that a good way for making a fundamental change that would probably effect all sorts of other situations as well.”

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