These are just a few investigations conducted by the state's anti-corruption body in its first year.

But charges have been laid in relation to only one of the investigations, as concerns mount that the body is toothless. The anti-corruption body has completed 10 investigations in the past year, according to a report.

One completed investigation found a police officer made a deal with a criminal to reveal how a police report fell into the hands of convicted double murderer Rod Collins, accused by Carl Williams of killing police witness Terence Hodson and wife Christine.

But the information and level of co-operation were deemed insufficient and the deal was called off. The defendant then relied on the agreement to avoid trial and asset confiscation. The Independent Broad-based Anti-corruption Commission found the agreement was unauthorised. The matter was referred to the Chief Commissioner and Victoria Police does not plan to take further action.

Early last year the commission received information about alleged attempts to bribe workers of the Greater Metropolitan Cemeteries Trust to secure gravesites.

''IBAC also received information alleging similar corrupt conduct elsewhere, due to high demand and limited supply of new grave sites, particularly at inner-city cemeteries.'' It said charges had been laid.

It also probed a complaint about alleged interference in the sale of St Brigid's church, in Crossley, by a local councillor, but found the complaint was unfounded.

The commission also reviewed a Victoria Police professional standards investigation into allegations Bairnsdale police station produced racist stubby holders.

It investigated the assault of an African-Australian man by a police officer in Stawell, and said the incident was not managed properly. In another investigation, it found proven links between public servants in Shepparton and bikies.