24 Hour Onsite Results provides 24/7 mobile drug testing in Chicago and surrounding suburbs. We specialize in DOT drug testing, non-DOT drug testing, post-accident drug testing, mobile alcohol testing, pre-employment drug screens, random drug testing, DNA testing, and onsite workplace testing services. Our certified mobile collectors travel directly to businesses, trucking companies, construction sites, schools, clinics, homes, and accident scenes. We offer fast response times, professional service, and same-day mobile drug and alcohol testing throughout the Chicagoland area, with most appointments available within 60 minutes. Office visits are available by appointment only Monday–Friday from 10:00 AM–3:00 PM.