Sarah Paino, 24, died at the scene when the car she was travelling in was hit by an allegedly stolen car in central Hobart.
A 15-year-old boy has been charged with manslaughter.
Ms Paino was 32 weeks pregnant and her baby was later delivered at the Royal Hobart Hospital, where he is in a stable condition.
There has been an outpouring of community support for the woman’s children and her partner, Daniel Stirling, who attended a vigil in Hobart on Saturday night.
Former Tasmanian policeman Phil Pyke said in Tasmania motor vehicle theft came under the Police Offences Act.
He argues it should be dealt with under the criminal code.
“It’s no deterrent at all with it remaining under the Police Offences Act,” he said.
“Over my time in Tasmania Police I’ve dealt with a young fella who had 43 charges of motor vehicle stealing and the very fact that it still continues to be a problem means that there is no deterrent.”
Mr Pyke believes not changing the law is putting the public at risk.
“We will still continue to see young people, multiple charges of motor vehicle stealing, no deterrent, the public will still continue to be at risk,” he said.
It is a call echoed by the president of the Police Association, Pat Allen, who said the current laws were soft.
“There doesn’t seem to be too many consequences at all, some sad events can happen rising out of motor vehicle accidents as we all know now,” he said.
But Evan Hughes from the Law Society said changing the law would cause problems.