A legal expert has recommended that the Government re-write its poorly written gang patch law. 

It follows a judge's recent decision allowing a Mongrel Mob member to have his patch back. 

Waikato University Law Professor Al Gillespie says the judge interpreted the law fairly.

He says the law is ambiguous as it doesn't say the patch must be destroyed. 

Gillespie says the law will need to be straightened out back in parliament. 

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