The formal police interviews confer immunity on the officers.
There is no formal police procedure to follow when making a harassment warning.
Like hundreds of others, he instead was taken to the nearby formal police district station at West Harrison Street and South Kedzie Avenue for booking.
In 2012, Lombard was put under formal police investigation accused of installing "brutal management methods" that amounted to "moral harassment".
The incident "was serious and should have led to Savile's suspension from the hospital and a formal police report being made", Johnstone said.
The Commons authorities referred the matter to the Met 15 months later, and a formal police inquiry was launched only in January 2011.
The project demonstrates that while more than 95% of sex workers are happy to share information anonymously, fewer than 25% are willing to file a formal police report.
He added: "The right place for me to respond to these allegations is either in a court of law or a formal police interview".
As a result, they said, the chase did not meet formal police guidelines for a pursuit that would have required them to seek authorisation to continue.
The kind of stings operated by 'Stinson Hunter', the star of Channel 4's documentary, in which potential paedophiles are lured in by fake internet profiles posing as underage girls are not necessarily helpful to formal police investigations.
