The police found no evidence of perjury.
In releasing today's report, IPCA chairman Judge Sir David Carruthers said that, given the public interest in this matter and the conclusion reached by the police investigation, the authority conducted its own investigation to satisfy itself there had been no police impropriety during the court proceedings.
"The authority has found that the cross-examination of Detective Inspector Wormald was designed to discover whether Mr Dotcom had been the subject of visual surveillance, not whether his communications had been intercepted. Mr Wormald's interpretation of the questions being asked of him was entirely reasonable and his answers were not in any way false or misleading.
"The suggestion that he intended to mislead the Court is without foundation," Sir David said.
Police Assistant Commissioner Malcolm Burgess said the report vindicated Mr Wormald, who is an "extremely experienced and dedicated career police officer, with the highest standards of integrity and professionalism".
"The allegations, when made, subjected Detective Inspector Wormald to intense media speculation and baseless, ill-informed commentary about his integrity.
"One can only hope equal prominence will be given to coverage of the Authority's report exonerating Mr Wormald."
"Welcome to Zimbabwe," said Kim Dotcom after the IPCA report threw out the complaint.
Dotcom said there was a developing pattern of rulings against him.
"The GCSB spied illegally. Final result: Cleared. John Banks commits electoral fraud: Final result: Cleared. Cop commits perjury in Court Final result: Cleared. Police raided me unlawfully: Final result: Cleared. Kim Dotcom is speeding: Let's deport him and his family.
"There is a pattern here. One law for them and one law for us."