South Australia's highest court has upheld the Government's anti-hoon laws after they were deemed unconstitutional last year.

Under the state's Forfeiture Act, the cars of people charged with repeat driving offences can again be seized by police and either sold or crushed.

Last year, Chief Justice Chris Kourakis ruled that police powers to confiscate cars applied a double punishment to offenders, after an appeal by Port Pirie man Graeme Anthony Bell.

He was ordered by a magistrate to forfeit his ute after recording a third drink driving conviction in 10 years.

The Chief Justice's ruling was based on a similar legal principle to the failed 2008 anti-bikie legislation.

Within days of the decision, the Government said it would appeal.

The Solicitor General argued that while the anti-hoon legislation imposed a mandatory sentence, it did not undermine the independence of the courts because they would still decide whether a person was guilty or innocent.

The Full Court of the Supreme Court allowed the appeal and ordered the magistrate's orders be reinstated.

Police Minister Michael O'Brien welcomed the judgment and said the Government was now considering when to recommence car-crushing.

In a statement, he said some of the cars seized by police are sold at auction with proceeds going to victims of crime.

"This is a deterrent that removes the prized possession of those who continuously flout the road rules, placing the lives of other road users at risk," he said.

"It is important that we provide [SA Police] with robust laws to tackle this issue and we will continue to work with them on measures to enhance road safety.

"The Attorney General and I will be considering the judgement in more detail and I will be seeking advice from [police] as to when the practice of car-crushing will recommence."

The Government says almost 8,000 vehicles were clamped or impounded, 26 were sold, 178 destroyed and six publicly crushed in the 2011/12 financial year.