The U.S. lambastes and strong-arms countries that help drug lords and millionaire investors hide their money from tax collectors. Critics say it should look closer to home. America itself is emerging as a top tax haven alongside the likes of Switzerland, the Cayman Islands and Panama. And states such as Delaware, Nevada, South Dakota and Wyoming, in particular, are competing with each other to provide foreigners with the secrecy they crave. There's a big neon sign saying the U.S. is open to tax cheats," says John Christensen, executive director of the Tax Justice Network. America's openness to foreign tax evaders is coming under new scrutiny after the leak this week of 11.5 million confidential documents from a Panamanian law firm, [which] show how some of the world's richest people hide assets in shell companies to avoid paying taxes. Christensen's group, which campaigns for a global crackdown on tax evaders, says the United States ranks third in the world in financial secrecy, behind Switzerland and Hong Kong but ahead of notorious tax havens such as the Cayman Islands and Luxembourg. Under a 2010 law, passed after it was learned that the Swiss bank UBS helped thousands of Americans evade U.S. taxes, the United States demands that banks and other financial institutions disclose information on Americans abroad to make sure they pay their U.S. taxes. But ... American banks don't even collect the kind of information foreign countries would need to identify tax dodgers.