Only hours after Mr.Karzai's victory in the tainted election, President Obama welcomed the Afghan leader's pledge to eradicate corruption, but frankly warned the proof of those efforts will be not in words,but in deeds.

VOA: standard.2009.11.17

"I think that by having people adopt a healthy lifestyle, both from a medical standpoint as well as nutritional and cognitive stimulation standpoint, that we can reduce the incidence of cognitive decline, which will be proof that these factors are, in fact,important."

VOA: standard.2010.06.17

In practice, they will be able to act only inside Japan, and proof of wrongdoing will, as now, be difficult to obtain.

ECONOMIST: Japan

Isabella Sankey of Liberty, a pressure group, fears the CPI could be worse than the ASBO, as the standard of proof will be lower and the test of anti-social behaviour broader.

ECONOMIST: Some new tools for fighting yobs, and fresh questions

You also don't need to be a libertarian to demand that any new intervention meet this burden of proof: It will accomplish something that tort law and enforcement of basic laws against force, fraud and collusion do not accomplish.

WSJ: Charles Murray: Why Capitalism Has an Image Problem