Presumptive tests, including immunoassays, TLC, and color tests, are only the first step in the testing process. If a sample tests positive with the presumptive test, the sample goes through confirmatory testing. Research the reliability of presumptive tests. Do you think a presumptive test will ever be sensitive enough that a sample does not need to go through confirmatory testing? Do you think analysts should only complete confirmatory testing and not presumptive testing