Iraq's National Security Advisor, Mouwafak al-Rubaie was in Washington this week and was asked about controversial security contractor Blackwater and the problem of holding security contractors accountable for what they do in his country.

NPR: Contractors Working Overseas Subject to U.S. Law

The Japanese technique circumvents the major ethical problem that has made research using embryonic stem cells controversial.

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Does the White House have any problem with federal dollars being sent to a counseling clinic that engages in the controversial therapy of trying to cure people of being gay?

WHITEHOUSE: Press Briefing

There is one further problem: that Mr Sarkozy is linked in the public mind with Mr Chirac's controversial 12-year reign.

ECONOMIST: French politics

Another problem, of course, is the elimination of the "up-tick" rule, a controversial SEC rule change last July (well-timed to the beginning of the credit market meltdown) that removed the rule that short-selling could only be done when a stock was rising.

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