Low unemployment rates obscure the struggles of manufacturers and workers, particularly in the Midwestern US, CNBC reports. Factories in the countryside are distant from pools of unemployed workers in cities. Drug tests are disqualifying more applicants. Low wages discourage others from taking jobs that are available, and employers say tougher immigration enforcement makes it difficult to fill many low-wage jobs. Among temporary manufacturing workers, the portion qualifying for government help jumps to 50% — on par with families of fast food workers.