A man is under arrest after a recording device was found in a toilet at a major hospital.
Police say a phone was found at a restricted toilet for staff inside the The Austin Hospital in Melbourne's north-eastern suburb of Heidelberg on July 3.
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Investigators believe it was there for "for some time" before workers became aware of the device and reported it to police.
A 27-year-old Heidelberg West man, reportedly a trainee surgeon, was arrested on Thursday morning and is being interviewed by detectives.
A spokesperson for the Austin Hospital confirmed police had been contacted.
"We take the safety and wellbeing of our staff extremely seriously and recently made a formal report to Victoria Police," they said.
"As this matter is now with the police, we are not able to share more information about the nature of the report."