Are inarticulate children twice as likely to be unemployed in their thirties?

A number of newspapers ran a story saying that children who have problems with speech and language at age 5 are twice as likely to be unemployed when they're in their thirties, and more likely to go to prison. I decided to ask for evidence for this claim. I started out by reading the report from the Communication Trust that was referred to by the articles. The report mentioned the same claims, but it didn't provide any references. So I emailed the author of the report. Happily, she replied very quickly and sent me a document full of references to peer-reviewed articles. I would say that this was a case of a successful ‘Ask for Evidence’