Last month, the government made synthetic cannabinoids, such as those sold under the name Black Mamba and methoxetamine, sold as Mexxy, illegal under the Misuse of Drugs Act.

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The post was signed "Mamba Out, " referring to Bryant's Black Mamba nickname, after the venomous snake, for his ability to strike suddenly on the court.

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In Liverpool a powerful but legal cannabinoid called black mamba is all the rage, says Russell Newcombe of 3D Research, an independent researcher and consultant in the field.

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Mexxy was linked to two deaths and police have warned of the "life-threatening effects" of black mamba.

BBC: "Legal highs" mexxy and black mamba banned by government