Given the sparse evidence, it will be difficult for any of them to find clear proof in the near future.

BBC: Ball lightning baffles scientists

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

ECONOMIST: Japan

The lesson here is one for creditors: It is not particularly easy to bring a fraudulent transfer action, especially where foreign transactions and entities are involved such that proof of the fraudulent transfer may be difficult to obtain.

FORBES: Kremen -- Failure To Prove Fraudulent Transfer