By Tristram Clayton
A West Auckland mother with inside knowledge of the synthetic cannabis trade says the scale of the problem is much worse than the public and authorities realise.
Former drug-taker Wena Theodore says homeless addicts are being used as human guinea pigs to test homemade chemical concoctions that are sold as synthetic cannabis.
"The dealers are just adding their own chemicals into this stuff," says Theodore.
"You got turps, methylated spirits, mental health medicine, sleeping pills and rat poison.
The dealers chop it up and grind it into a powder and sell it as synthetics."