This link contains details of a 2015 NSW case snd the Judge's decesiin against the NSW Police was scathing. Shows just how serious the charges are!
Surveillance Devices Act 2007 (NSW) - Wikipedia
Then find your way to the heading 'Admissibility of evidence obtained by surveillance device'....
In
R v Simmons (No 2) [2015] NSWCCA 143 members of the NSW police were undertaking a complex undercover sting operation. They had obtained surveillance device warrants on a number of occasions to record conversations they had with a man suspected of murder. However, two of the warrants had expired by a number days and police had failed to apply to have the warrants renewed. The Prosecutor submitted that it was merely an oversight and the unlawfulness or contravention of the Act was not serious. Justice Hamill disagreed saying at [138]:
“Contrary to the submission of the Crown, I find that the impropriety is quite grave: s 138(3)(d). The rights to silence and to privacy are important parts of a functioning democracy and free and civilised society. Where safeguards such as the Surveillance Devices Act are enacted, law enforcement officers must be fastidious in ensuring that they are complied with.”
[33]