A proposal to alcohol and drug test suspects after a violent assault has gained early support following the death of Sydney punch victim Daniel Christie.
It's expected NSW Bureau of Crime Statistics director Don Weatherburn will suggest to the state government that it allow police to carry out the testing, Fairfax Media reports.
The tests would be done following assaults that end in hospitalisation.
NSW Council for Civil Liberties president Stephen Blanks has also indicated support for the plan but with restrictions.
The testing should only be carried out once charges have been laid, Mr Blanks told AAP on Sunday.
"This proposal is targeted at people who have been charged with serious offences," he said.
"It is not a proposal to allow random breath testing of people in the street - we would certainly oppose that."
However, some police interviews for violent offences can take several hours before charges are laid.
Despite the fact that it can take several hours before charges are laid for some violent offences, Mr Blanks said until police were in a position to charge someone, there was no justification in testing.
Mr Blanks said when an accused did not give consent to be tested, an authority independent of the police could provide the consent.
He gave the example of a magistrate approving requests for DNA testing.
Acting Opposition Leader Linda Burney told reporters on Sunday people would be surprised the alcohol and drug testing proposal was not already the case.
In a statement, Ms Burney said the Opposition would consider any "sensible measure to help stop" alcohol violence.
"However we need to listen to the experts and address the availability of alcohol in the community," she said.
The proposal for greater police powers comes a day after Mr Christie died in hospital.
His family turned off his life support on Saturday afternoon.
Mr Christie was punched in Kings Cross on New Year's Eve.
Attorney-General Greg Smith has asked the director of public prosecutions to assess if a murder charge against Christie's alleged attacker, Shaun McNeil, is appropriate.
He was hit just metres from the spot where Thomas Kelly, 18, was punched in 2012.
Mr Kelly also died in hospital.