This drug test is used by the government, the department of transportation, and a whole host of private businesses. This is because it has historically been the most effective at filtering potential employees who will reduce the productivity of your company. Avoid hiring potentially irresponsible and unproductive employees by learning about 5-panel drug testing. Read on to learn about these common drug test kits, how to buy this drug test in bulk, and why you may need the 5-screen drug test in your own workplace.