Victorian police officers have been charged more than 600 times with criminal offences including drug trafficking, rape and possession and production of child pornography since 2006.

Figures obtained under freedom of information show that internal police investigators charged a total of 177 officers with 661 offences from July 2006 to June 2012.

Police Association secretary Greg Davies, when asked about criminality in the police force, suggested there might have been a failure to spot the ''bad eggs'' at the recruiting stage but said more than 99 per cent of officers were hard-working and honest. ''The data shows that [criminality] is at a constant rate. You'd prefer it was zero but at least it's not increasing,'' he said.

Mr Davies said the association had a $22 million legal representation fund.

The figures show that internal investigators charged 30 officers with 133 offences in the year to June 2012, the most recent period for which figures were available. A total of 16 per cent of the charges were the result of public complaints, compared with 57 per cent in the year to June 2007.