Several tracks this week imposed new policies prohibiting jockeys from riding at other racetracks as a measure to stop the spread of COVID-19.
Mike Brunker

Clark County announced 1,315 new cases and the state added 1,447 cases, the largest one day gains reported by both agencies.
The Southern Nevada Health District reported more than 1,000 cases and also reported 15 additional deaths.
No new deaths were reported by either the Southern Nevada Health District nor the state Department of Health and Human Services.
Nevada recorded 1,004 new cases of COVID-19 — the second biggest daily increase announced by the public health officials — and eight additional deaths, new state data show.
Trainer Bob Baffert will fight any adverse ruling by Arkansas racing authorities after two horses were “unknowingly and innocently exposed” to lidocaine, his lawyer said.
New cases were well below the daily average of nearly 614 over the preceding week, while deaths were well above the daily average of nearly five over the period.
Both the Southern Nevada Health District and the state Department of Health and Human Services reported new case totals that were well below averages of the past week.
New cases were well above the daily average of slightly over 596 for the preceding week.
New figures posted Monday pushed the case total for the county to 18,818, while fatalities from the disease caused by the new coronavirus were unchanged at 439.
That would be crazy talk in any year but 2020, but this year, when the Breeders’ Cup will follow hard on the heels of the Derby and the Preakness Stakes, it makes some sense.
Clark County recorded 576 new cases of COVID-19 and a dozen additional deaths over the preceding day, according to data posted Thursday by the Southern Nevada Health District.
Wednesday’s report marked the fourth time in the last five days the county has seen a daily increase of at least 500 cases.
New cases were lower than the totals reported over the past three days, when a major surge in infections occurred.
It was the third straight day the health district reported more than 600 new cases in a 24-hour period, though the Saturday and Sunday counts were both inflated by older cases.