"MORE deluded harassment of cannabis users" is how Mardigrass president Michael Balderstone has described the introduction of a drug testing machine able to be used daily to test Northern Rivers motorists.
This month Highway Patrol Senior Sergeant Chad George said a Dragar Drugtest machine would be kept permanently at Lismore police station from May 2015.
Mr Balderstone said police should listen to Magistrates David Heilpern and Jeff Linden.
"The police should absolutely consider the recent statements from Lismore Magistrates re drug driving cases where it was clearly pointed out that impairment need not have anything to do with drivers registering positive for Cannabis in their system."
Mr Balderstone said people granted permission to use cannabis for medicinal reasons would be living with the fear of prosecution.
Transport for NSW could not provide details of any plans for identification of approved medicinal cannabis users to help avoid prosecution.
Centre for Road Safety general manager Marg Prendergast said cannabis posed a road safety risk. "If a person has cannabis in their system, they can't get behind the wheel," she said.