Schedule. Tuesday - Saturday, 9 AM - 5 PM. Pay Rate. $18/hour for the first 3 months, increasing to $19/hour after the probationary period. Company Overview. Founded in 2013, GTI Laboratories has quickly established itself as a leader in the field of toxicology and clinical laboratory services. With our state-of-the-art facility located in Scottsdale, Arizona, we operate under CLIA and CAP licenses across 47 states. Our dedicated team includes to...