But the recreational drug use or supply cases appear to have come about from information gathered in the course of the race-fixing investigation.
Only one person, a 26-year-old male who appeared in a Christchurch court yesterday and was granted name suppression, has been charged with both race-fixing and drug supply offences.
The story has rocked the racing industry to its core and looks set to get bigger as at least one other leading horseperson is named in court documents relating to the drug charges.
Earlier today the Racing Integrity Unit banned all six trainers or drivers charged from attending race meetings, which now looks certain to happen to the two latest trainers charged.
That will mean at least eight horsepeople who could have had horses racing at Addington this Friday night will not be able to attend and the RIU will then rule on whether that can participate in racing activities before their cases are heard.
Harness racing bosses are dismayed by the rapidly-growing number of cases but have vowed their flagship national awards, for which some of those charged were in the running for honours, will still go ahead at Alexandra Park on September 29.
With that night not seeing Alexandra Park hosting a race meeting, any industry member who has been charged would still be able to attend.
Early today a race held at Nelson on June 8 was named in court as being part of the race-fixing investigation while the Herald understands a relatively minor race at Manawatu earlier in the year, is also under investigation.
One of the industry's glamour events, the $200,000 New Zealand Derby at Addington in April, was investigated by police but seems unlikely to be at the centre of any race-fixing allegations.