I've just completed the assessments and drug/background screening for shift key. I've signed up for several shifts this month and 2 were declined, 3 were approved and the rest are still pending. I'm not sure how they decided who to pick, but they declined me and posted the same shift on another agency site. I don't see this as a replacement for my previous job. I will continue to try them out, but I'm definitely going to find a permanent job ASAP.