A crucial witness against Christian Brueckner, the prime suspect in Maddie McCann's disappearance, is set to testify once again.
Brueckner's lawyer claimed former pal-turned-police informer, known only as Helge B, whose testimony once helped put him away for seven years, was lying about evidence.
However, a German judge has thrown out the claims that Helge was making false statements.
Helge, who has been dubbed the most important witness against Brueckner, is set to once again prove vital in a case against the convicted rapist next month.
Madeleine McCann and Christian Brueckner
PABrueckner who is suspected of having kidnapped and murdered Maddie in 2007, is set to stand trial next month over five more alleged sex crimes. He is currently serving a prison sentence in Germany for the rape of a 72-year-old woman.
A source close to the Maddie investigation previously told The Sun that Helge described his boasts about being a "master criminal" after allegedly snatching her.
The source claimed that he had stolen a camera and videotapes showing Brueckner raping several women, evidence which helped put him behind bars.
The convicted rapist's lawyer claimed that Helge, dubbed the most important witness in the case against his client, was lying about the tapes.
Helge originally said he probably left the incriminating video tapes in his caravan in Portugal before he left the country.
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Apartment 5A in Praia Da Luz in Portugal, where Madeline McCann went missingPAHowever, while being interviewed about Maddie, he said he may have left them at a holiday home he was living in at the time.
Brueckner's defence lawyer Dr Friedrich Fülscher then reported him to prosecutors for making false statements.
Now, a judge has since ruled there is no evidence he was lying, meaning Helge is set to testify at the Braunschweig Regional Court in February.
They argue he never claimed to know specifically where he left the tapes, and was just guessing.
Prosecutors also said a false statement would be of no benefit to him and that he appears to want to find them.
It is also thought that Helge first told other witnesses about the disturbing videos in 2006, before Maddie was taken.
In June last year, Helge revealed the moment that Brueckner "confessed" to snatching the little girl.
He revealed how his blood ran cold the day the convicted paedophile told him that "she didn't scream" shortly after Maddie disappeared from a holiday apartment in Praia da Luz.
The petty criminal and burglar said he first met Brueckner around the time Maddie vanished from her parents’ holiday home in Praia da Luz in 2007.
After Helge testified to this in court Christian was sentenced to seven years for the rape of a pensioner in 2005 in the Portuguese resort.