The US is home to around seven million undocumented migrants from central and south America. Many have been in the US for years, providing a vital workforce for many sectors of the US economy. But they have no health cover, or workplace benefits and many live under the constant threat of deportation back home. As Americans prepare for another presidential race where immigration is likely to figure high again on the agenda, Mike Lanchin travels to the state of Maryland, to hear about the lives of some of its large undocumented Latino population. He speaks to Maria who gets up at 5am for work, but has no holiday or sick pay. He meets Delmi, who has been using false papers to get work, and Toño who came to the US as an unaccompanied minor but now has a temporary work permit.