In Drivers, said drivers are recruited via the internet. I didn't go into specifics, and I didn't ever do the "research" to find out exactly how this could be done—until this morning. A few people wanted to know more about how the company found suicidal people. I didn't think it was important, and frankly, I was a little uncomfortable with searching for actual people.
As it turns out, it's easier than I thought. A Google search, a result on the first page, and there they are. Some of them want to be contacted, and for various reasons—advice of both kinds, help of both kinds.
I added a few sentences to my book to clarify this, and that's enough. Rest assured that whatever you're looking for online, it's there.