A WA police officer has told the Corruption and Crime Commission that he had been trained to use Tasers to force people to comply with police instructions.

Police procedures prohibit the use of Tasers for compliance.

Senior Constable Troy Tomlin is appearing at a public hearing of the CCC which is investigating the conduct of police and prison officers during a series of Taser incidents in 2008 involving Perth man Kevin Spratt.

The officer told the CCC that he had tasered Mr Spratt in the Perth Watch House because he was concerned he was at risk of injury from other officers trying to move him to a cell for a strip search.

He also told the CCC police procedures clearly state the weapon can only be used to prevent injury.

Senior Constable Tomlin said it was clear to him that if someone refused a breath test, he could not, in his words "zap them."

But, he conceded there was a grey area because he had been trained and told by at least one senior officer, it was okay to taser prisoners to remove them from police vans.