Bagdad harness racing trainer Paul Williams has been fined $3000 over a positive swab returned by his horse Chasing Cheetahs at Devonport three months ago.
A urine sample taken from Chasing Cheetahs, who finished fourth in the C2/C3 Pace on March 8, contained arsenic levels above the allowable threshold.
Williams pleaded guilty to presenting the horse to race when not free of all prohibited substances.
Stewards suspended half the fine on condition the trainer does not offend again in the next 12 months.
Meanwhile, an unnamed harness racing participant has been fined $1500 over an incident at the Mowbray race meeting on May 3.
The participant pleaded guilty to "acting in a manner detrimental to the industry" by deliberately causing damage to another participant's vehicle.
Half the fine was suspended on condition there is no further offending in the next 12 months.
Stewards refused to name the person involved as they said the incident was related to a on-going court case.
Harness racing returns to Devonport on Friday night with two heats of the Raider Stakes and a prelude to the Granny Smith Stakes.
Greg Mansfield