Presumptive tests are a type of test, common in forensic investigations, which establishes a relationship between a sample and a specific substance in question. A presumptive test can result in two answers: 1) the sample is not the substance or 2) that sample is likely the substance. If the test indicates that a sample is likely the substance, further chemical tests are needed to confirm identity. An example of a presumptive test is the Kastle-Meyer test which can be used to indicate that a substance is likely, or defiantly not blood.