Tales of dodgy cops abound this week, with accusations of robbery, corruption and money laundering levelled against several guardians of the peace.

Bail has been refused in the case of a New South Wales police officer accused of involvement in an attempted robbery.

NSW Senior Constable Ashur Oshana was among three men arrested in Sydney following a bungled robbery this week.

Court papers say police allege that Oshana and two co-accused - Phillip Truong and Jamal Tashman - capsicum sprayed several victims while robbing a money transfer business. The trio were arrested with a bag containing $300,000 cash.

The Constable was suspended from duty without pay and under surveillance at the time of his arrest.

Separately, a former Queensland Police detective is under investigation after money laundering and corruption claims.

Investigators are looking into former cop Michael Featherstone's links to high-level serving and former police officers around the state. They are also probing his possible connections to motorcycle gangs and cold-calling companies alleged to be involved in fraud.

The companies make unwarranted calls to homes nationwide, advertising horse betting software and similar investments, but are alleged to have ripped-off hundreds of people for millions of dollars.

Mr Featherstone's name reportedly came up as part of Queensland police anti-bikie taskforce Maxima’s investigations. It found potential links between Mr Featherstone (himself a former fraud squad detective) and members of the Black Uhlans and Bandidos outlaw motorcycle clubs earlier this year.

The matter has been referred to the state’s Crime and Corruption Commission because of its forensic accounting expertise, and to ensure that police are spared from investigating possible involvement of police officers in protecting Mr Featherstone.

Mr Featherstone has been linked socially with serving senior officers in photographs and most prominently at a retirement party for a high-ranking Gold Coast officer, at which Featherstone made a short speech.

He now runs private investigations firm Phoenix Global, which specialises in cleaning-up the online image of companies and individuals and counts convicted rapists, fraudsters, kidnappers and extortionists among its clients.

Featherstone is part of a deep investigative effort by both the corruption watchdog and reporters for the ABC.