Speaking to BBC Sport, Murphy admitted he had witnessed cocaine being used the night before travelling to France.
Murphy said: “I became aware of a situation where cocaine was present in my environment and I saw it there and didn’t remove myself from that situation immediately.
“When you sign for your jockey’s licence every year you have got to abide by the rules.
“That was my error, and I very much have no self-pity. I made a mistake and I’ve got to live with the consequences.
“I got up the next morning and went to France and thought nothing of it. But I should have thought much more of it, and that was the block I have stumbled on.”
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