The RSPCA has successfully prosecuted members of the Heythrop hunt - David Cameron's local hunt - for intentionally hunting a fox with dogs.
The judge in the trial said it was "quite staggering" that the RSPCA had spent £330,000 bringing the action.
Several videos were taken by anti-hunt activists who say they are clear evidence of illegal hunting. The pictures were used to prosecute the Heythrop hunt.
Gavin Grant, the chief executive of the RSPCA, told the Today programme they decided to prosecute themselves as many cases they pass to the Crown Prosecution Service do not make it to court.
"When the CPS hand these prosecutions back to us saying there's insufficient evidence, it's then too late to mount a prosecution," he said.
"We decided on this occasion we would take this prosecution because the evidence was clear."
"I find it staggering that people break the law wilfully and therefore cause this amount of expenditure. Nobody is above the law."
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