Cut-off levels are defined as the level of concentration of a drug above a specified level in a drug test. It is when this concentration level is above the cut-off level that the test is deemed positive and should be sent to a testing laboratory for further testing. 

The cut-off levels can vary from country to country. When setting up their Drug and Alcohol Policies businesses may also specify their own cut-off level. For this reason, it is important to ensure that the drug testing kit has your required cuff-off level. Otherwise, you are paying for a drug testing kit that uses a different cut-off level then your policy allows.