Defense lawyers saw in the decision a far greater potential of reversing recent convictions.
Last November, after 16 months, a state appeals court reversed his conviction.
The judge said the evidence was not persuasive enough to reverse convictions that were more than a decade old.
This month, the appeals court reversed her conviction and ordered a new trial.
The Supreme Court reversed his conviction in a 5-4 vote.
On May 8, the appellate judges agreed and reversed his conviction.
A12 Germany's top court reverses a politician's conviction for racism.
Other states, however, had already begun reversing convictions on entrapment grounds.
They said the Court would continue to reverse convictions based mainly on coerced confessions.
On 5 June 1961 the Court reversed his conviction.