The Drug Foundation says nearly one in five drugs it checked last year were not what people thought they paid for.
The foundation says its drug-checking services are testing fifty percent more drugs compared to last year, allowing more and more people to check what's in their drugs and letting them know how to stay safe.
Cocaine and methamphetamine are the most likely to be something different to what they were sold as.
Drug Foundation executive director Sarah Helm spoke to Ingrid Hipkiss.
