michelle krusa cabrera tells us why the report from petro boss is so important and why the stakes are so high not just for investors but also for brazil's economy. >> petro bross is the world's most endebtled company and in a world awash in debt that is saying a lot anden meshed in the greatest financial debt in brazil and if you know brazil that is saying a lot. even though the company stock trades at the new york stock exchange make no mistake, it is controlled by the brazilian government and they have more than half of the voting shares and the company is used by the government as an sarm of their policy. all of that may be coming home to roost. in march of last year one of the company directors was arrested for bribery and in september he started to sing like a canary. he told investigators that for nearly ten years almost all contracts were padded by 3% and that extra money was used for bribes and kickbacks, a lot of it funneled to the ruling parties of the country. and now nearly 50 people have been arrest or charged, including dozens of ceos of construction companies, party mem