An Australian Federal Police (AFP) raid on the construction union's Brisbane headquarters in November last year was legal, the Federal Court in Brisbane has ruled.

However, the AFP is still unable to examine the documents it seized until a further judgment is handed down next month.

Tens of thousands of documents and electronic files were seized from the Construction Forestry Mining and Energy Union's (CFMEU) offices during the raid.

The CFMEU had sought an injunction to prevent the AFP from accessing and viewing the files, some of which the union argued were professionally sensitive.

In a ruling handed down today, Justice John Reeves ordered the injunction remain in place until both parties come up with a proposed protocol for accessing the documents.

The matter will be back in court next month.

Earlier this year, the Federal Court heard officers seized the hard drive of the union's Queensland secretary, Michael Ravbar, and made copies of the main computer server and email database.

CFMEU barrister Tony Glynn argued that was not agreed to by the union lawyer present during the raid, and described the police conduct as "unreasonable".

AFP barrister Roger Derrington QC argued that under the Crimes Act, police are entitled to seize or make copies of all documents or data from a certain device if there is a suspicion it is deemed necessary to an investigation.