Oh, now you are going off...
Apple has published reports since 2007 where they are actively looking for underage employees. Fact is that 15 year olds actually like making money and apply for jobs, and sometimes they are not caught immediately. What happens is that Apple finds out, puts it into their report, and makes the company in question pay for these kids to go back to school. Usually the numbers are so small that we can assume this happened by accident. Companies don't hire one or two 15 year olds intentionally. It doesn't save money and only creates trouble. But twice so far Apple found companies that hired so many underage employees that it looked intentional. Apple cancelled contracts with those companies.
Samsung on the other hand _claims_ they are making checks, but somehow they never, ever find someone who is underage. Here's the problem: We _know_ that's a lie. Apple is checking close to 200 suppliers, and there are always a few kids that get through the checks at various companies (plus sometimes a supplier who intentionally hires underage children). It's impossible that this doesn't happen with Samsung suppliers. Which means that Samsung isn't actually looking, or actively looking in the wrong direction, or they know what's going and are lying.
And right now a new report on the register:
http://www.theregister.co.uk/2014/07/10/samsung_new_child_labor_claims/