"In the absence of clear scientific and health information, there has been an assumption among the general public that the presence of even trace levels of methamphetamine residue poses a health risk," Gluckman said.
"There is absolutely no evidence in the medical literature of anyone being harmed from passive use, at any level. We can't find one case."
Gluckman said testing and cleaning still made sense when there was suspicion that methamphetamine had been produced on a property - but this was more to do with reassurance.
He said a "moral panic" around cleaning and remediation had occurred only in New Zealand. If science had been involved earlier in the policy-making process this could have been avoided.
Mould was a much larger health risk to tenants than meth residue.