Rapid competitive immunochromatographic screening tests for the detection of ketamine, methamphetamine, methadone, or morphine. The screening tests showed positive results only for methamphetamine (A). The interpretation of test (B) is based on the pink coloured bands appearing at the control region (C) and at the test region (T). Two pink coloured bands appearing at C and T region indicates absence of methamphetamine in the specimen. Only one pink coloured band appearing at the C region indicates the specimen contains a detectable amount of methamphetamine. If no band appears at the C region, this indicates the test result is invalid.