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The test found Warrior’s Charge had 2.51 micrograms per milliliter of phenylbutazone in his blood after the Grade 2 race on June 26 in which he finished 3 1/4 lengths behind Maxfield.

At present, any horse not signed out of the human food chain cannot be given certain drugs, such as painkiller phenylbutazone, or 'bute'.

Most were for excessive use of phenylbutazone, a commonly used anti-inflammatory known as bute.

Dancer’s Image in 1968 is the only previous Derby winner to be DQ’ed after the fact for failing a postrace drug test, in that case for the presence of nonsteroidal anti-inflammatory drug phenylbutazone.

In 1968, Dancer’s Image won the Derby but then officially gave way the following Tuesday, when the presence of phenylbutazone in a urinalysis tilted the win to runner-up Forward Pass.