US prosecutors and IRS agents are deploying undercover agents and closely examining records to build criminal and civil cases against wealthy individuals suspected of illegally taking advantage of tax breaks offered by Puerto Rico. The cash-strapped island used eye-popping incentives to lure hedge fund managers, cryptocurrency traders and other Americans to the US territory over the last decade. But investigators are now focusing on whether people lied about how much time they spend on the island and the source of their income, according to people familiar with the matter. US officials are also looking at the ... (full story)