| 1 | Adecco is the world's largest staffing service. Most of their employees work on temporary jobs at their client locations. Due to various job requirements at each client location, Adecco performs various types of drug testing. Their most popular drug test is urine, however they do perform hair, saliva, DOT, etc. as requested by their clients. They never use dip or cartridge testing and all employees are sent to a LAB.
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