Former WA Police Commissioner Karl O'Callaghan has taken aim at the WA government's war on meth, saying taskforces, seizures and arrests aren't making any difference.

Speaking on 6PR's Weekend Breakfast, Mr O'Callaghan said past and current governments had poured a lot of money into tackling the issue but meth use remained high.

Former WA Police Commissioner Karl O'Callaghan.

Instead, Mr O'Callaghan said the government should divert first and small-time meth users away from the courts and into therapeutic programs.

"We've seen a lot of stuff seized, we've seen some Mr Bigs gone after but it still isn't making any difference to availability," he said.