Detective Superintendent Chris Bourlet of the Met's Child Protection Central Command told Newsnight reporter Angus Stickler the scale of the problem was difficult to determine.
The health care problem is made vastly more difficult by the immigration problem.
Brazile recalled this as the precise moment when she knew Daley could tackle any difficult problem.
Specifically, students can be taught emotional control and expression and problem solving in difficult social situations.
Conservative councillor John Knapman said it was a "difficult problem at this time of year".
But overall, diabetes, driven so intensely by overweight and obesity, "is a terribly difficult problem, " Dr. Weir says.
Each one of these is a difficult problem to unwind, and many of us struggle with more than one.
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Coping with exceptionally disruptive or dangerous prisoners is certainly an acutely difficult problem.
"The roots of the problem are incredibly difficult to address, " says Dr Spottiswoode.
Present a difficult problem, they provide a clear, direct, and preposterously simplistic answer.
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It strikes me that trying to define where the front lines are might become a very difficult problem in wartime.
We had a technology company come to us some time ago, before the tech bubble burst, with a difficult problem.
But Mr Clegg said the government had come up with a "fair and progressive solution to a very difficult problem".
This led to a third and more difficult problem, the question of who should pay for the health care program.
And the power struggle in Sanaa is not even the most difficult problem the National Dialogue Conference will face, adds Ms Alley.
With the war, the problem became more difficult to solve than ever.
"In many respects, Afghanistan represents a more difficult problem set, " he said.
That was before the FTC announced last October it was launching a nationwide contest to get the public's help in solving a difficult problem.
My wife had a very serious and difficult problem, and her GP advised that the only hospitals she should consider were Mass General and Beth Israel.
Another difficult problem is that the Indian market demands a cash on delivery (COD) option, in which the consumer pays the courier once they have received the product.
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"The MCS recognises that Combined Sewer Overflows (CSO) are necessary to avoid sewage flooding roads or people's houses, and that diffuse pollution is an entrenched and difficult problem, " Mr Bell said.
The problem: very difficult to generate a sustainable revenue model.
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"Delivering good support on the Web is an enormously difficult problem that often involves thousands of documents, complex navigation and search tactics, and an unusually demanding customer base, " Tarter says.
They have been asking the U.S. forces at checkpoints not to search the Iraqi women, but that is a very difficult problem that coalition security forces will have to work out.
At one meeting in 1975, he told them everybody wanted to avoid a statutory pay policy but he could not dodge the difficult problem of getting people to stick to voluntary arrangements.
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Richard Thomas of Traffic told CNN that Internet sales of ivory was potentially a major problem that was difficult to combat, but said eBay had been good at monitoring and removing anything illegally posted for sale on the site.
As the ingredients of food become ever more characterised and understood, and their links to human health established, the EFSA has a difficult problem applying a scientifically rigorous approach to health-related claims without assuming the weighty bureaucracy of a pharmaceuticals regulator.
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