This from Anderson at drf:

"The Breeders' Cup horses racing at Santa Anita on Friday and Saturday are being watched. Since Tuesday and Wednesday, all runners are under surveillance from a security team on a 24-hour basis leading to the races.

BC officials discussed security and safety issues at a press conference on Thursday morning.

Out-of-competition testing has taken place on a third of the runners, selected randomly, in recent weeks, according to Dr. Rick Arthur, California's equine medical director. Arthur said that all completed tests have shown no positives, and that one of the tests is being conducted today.

Overall, 150 surveillance staff have been hired for the 24-hour security team. In addition, California Horse Racing Board investigators and their counterparts from other circuits, are working in the barn area.

The security staff will register hour-by-hour activities for all horses, recording the names and occupations of anyone that goes into a stall.

Pre-race inspections will be handled on Friday and Saturday mornings by teams of veterinarians. Vets will also be in the paddock and on the racetrack, as is customary on a year-round basis in California."