The program at Canberra's Groovin the Moo festival at the weekend tested 171 samples from 234 festival goers.

Seven dangerous substances were detected, with patrons using an amnesty bin to toss the drugs once alerted.

But Tasmanian Liberal Health Minister Michael Ferguson on Tuesday reiterated the state government was opposed to pill testing in any form.

"We do believe that such an initiative can send a very dangerous and risky message," he told parliament.

"We don't support quality controlling illegal drugs that are being pushed by drug pushers."

Mr Ferguson, who declined an invitation to attend the trial in the ACT, said the government supported people saying no to drugs and pointed to the opening of 31 rehabilitation beds across the state.

"There is no safe use of an illicit drug," he said.

"We're all about supporting people from a health perspective as well as from a police perspective."

NSW Premier Gladys Berejiklian also remains opposed to pill testing after Sunday's trial, which followed an Australian-first pilot in 2018.

Australian Associated Press