I would think this is more common than we will ever know.
"Indiana Horse Racing Commission has filed an administrative complaint against Dr. Ross Russell, recommending a 20-year suspension and $20,000 fine for allegedly breaking numerous IHRC medication rules"
"Rees said she was instructed during her employment by Russell to deliver injectable bottles and loaded syringes for several trainers, including Ron Raper and Mike Norris. “Dr. Russell instructed me to stand on the toilet in trainer Norris’ bathroom, and leave a syringe on the ledge to the right,”
http://www.paulickreport.com/news/ra...s-20-year-ban/