Smoken Up's Interdominion's title is in serious doubt, after a B sample also tested positive for a banned substance.
The Australian pacer won last month's prestigious Group One harness race at Alexandra Park, but returned a positive sample to a drug test.
The second sample has now been examined and it has also tested positive.
It means the title is in serious danger of being stripped with trainer Lance Justice believed to be appealing the ruling.
- NEWSTALK ZB
Racing: Interdominion winner fails drug test
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