The Victorian Labor Party will introduce random breath tests for MPs and judges during sitting times in a bid to raise parliamentary standards if it wins Saturday's election.

Opposition spokesman Martin Pakula said the Labor Party had been "horrified" by chaos and dysfunction in Parliament over the last four years and was determined to raise standards.

He said Parliament had become a "circus" and Question Time was used for "political gain".

Mr Pakula said he was aware of instances where MPs had been drunk in Parliament but that it was "not widespread".

"I don't want to overstate the size of the problem, but it has occurred," he said.

"I think anyone who has been in Parliament for long enough has seen other members who have maybe not been in the best shape when they've been in the house."

He said the issue would be referred to a joint party parliamentary committee to assess the best way to impose random breath testing and to determine the sanctions.

MPs not expected to be 'monks'

"We will make sure once that committee has made that determination, that members of parliament can be appropriately tested and the same will apply to judges," Mr Pakula said.

"MPs will be on notice that random tests can occur at any time.

"I think this is about attitude, it's about behavioural change and it's about making sure that the people who make the laws are also abiding by the laws."

He said MPs are not expected to be "monks".

"We're saying 0.05, we're not saying people should be 0.00 or can't have a glass of wine with dinner," he said.

Premier Denis Napthine said he had no personal problem with the plan but called it a "political stunt" on the eve of the election.

"This is very hypocritical from Daniel Andrews and the Labor Party who opposed drug and alcohol testing of workers on construction sites," he said.

"So on potentially dangerous construction building sites, Daniel Andrews opposes drug and alcohol testing, yet in a political stunt he wants to introduce it for judges, magistrates and MPs."

Mr Pakula said it would be a matter for senior judicial officials to decide how the testing would be carried out in regards to the courts.

Labor leader Daniel Andrews said those who made and enforced the law should be held to account.

"Our Parliament is not a pub, it is a workplace," he said.

"I think if you're making laws about 0.05, or if you are adjudicating and enforcing laws about 0.05, you ought to be able to abide by those laws."

In a statement, the Chief Justice of the Supreme Court, Marilyn Warren, the Chief Judge of the County Court, Michael Rozenes, and the Chief Magistrate of the Magistrates' Court said "these types of matters would be well covered by existing mechanisms".

"They would also be covered by the proposed Judicial Commission," the statement said.

Dorothy Dixers 'a total waste of time'

Mr Pakula said Labor would also give the Speaker and the president of the Upper House the power to decide whether or not a minister had answered a question.

"If a minister has been non-responsive, the speaker will have the ability to ensure that that minister provides an answer in writing by the next sitting day," he said.

MPs would also be allowed to ask supplementary questions.

Mr Pakula also called for a ban on so-called Dorothy Dixers, where a minister is asked an easy question by a member of his own party, something Mr Pakula called a "total waste of time."

Mr Pakula said at times, all MPs speak longer than they should and ministers dodge questions during Question Time.

"I think it's important that answers be succinct, that members have a chance to ask a follow-up and that Dorothy Dixers which really serve no purpose other than to turn Parliament into a circus, be done away with," he said.