Mr Wilson (27) died in Dunedin in March 2006 after taking a methadone dose six times higher than he was prescribed.
The dose was meant for someone else who looked similar to Mr Wilson, and was given by a pharmacist at Dunedin's Campus Pharmacy.
He identified him on sight, a practice staff at the pharmacy told subsequent investigators was the norm.
Mr Wilson's mother, Donna Letham, and father, Michael Wilson's idea has support from the medical director of Dunedin's Community Drug and Alcohol Service (Cads) and the new owner of the Campus Pharmacy, but is adamantly opposed by the man who owned the Campus Pharmacy at the time of the mistake that led to Mr Wilson's death, Peter Barron.
A report released this week by the Deputy Health and Disability Commissioner, Rae Lamb, blamed Mr Wilson's death on Campus Pharmacy's lack of clear written guidance and instruction on identifying methadone patients.
Mrs Letham said a computer or card system that identified methadone clients by photograph would reduce the opportunity for "simple" mistakes to be made in dispensing.
Cads medical director Gavin Cape said he supported the idea and, in fact, had been "giving it a bit of a push".
Standard methadone dispensing procedures would not be flexible enough to meet the needs of the variety of patients taking methadone, he said, but he supported any moves to standardise the identification process.
It was an easy enough thing to do to avoid any more tragedies like Mr Wilson's death, he said.
The new owner of North Dunedin Pharmacy, formerly known as Campus Pharmacy, Chin Loh, also said he supported the family lobbying for a national protocol to be developed.
Dispensing the wrong methadone was a "fairly simple" mistake that could be easily avoided, Mr Loh said.
While he was already upgrading his identification system to include photographic identification of methadone clients, he did not believe it would become a national standard if it was left to the industry to drive because it would be considered too much work by many pharmacists.
Former owner Mr Barron said he hoped Mr Wilson's death would not be used to make emotive decisions about how those on the methadone programme should be treated.
These were people who were wearing "chemical hand-cuffs"; people who were already marginalised and should not be treated differently from anyone else receiving legally prescribed medication.
He did not believe that it was appropriate to have retinal cameras or similar measures used for identification.
"Why impose a higher level of identification for methadone clients than we would impose on anybody else?"
Campus Pharmacy had "bent over backwards" to provide an empathetic, specialised service to those on the programme, he said.
