It happened on numerous occasions.
The prosecution now believes that certain evidence is "implausible".
Former mayor José Hila's conversation with a police officer implicated in the police corruption and Cursach cases was recorded.
The group of officers were involved from the start of investigations into Palma police corruption.
The two parts of the trial will revolve around Bartolomé Cursach and Miguel Pascual.
Meanwhile, the prosecution service has opposed an appeal on behalf of Tolo Cursach for his release from custody.
The investigating judge in the police corruption case believes there are risks to witnesses' lives.
Both Aurora Jhardi and the councillor for public safety, Angelica Pastor, say they did not meet the police officer in question.
José María Rodríguez is to appear in court tomorrow to answer questions from the judge investigating allegations of corruption in the Palma police force.