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This test covers the application of immunological methods in forensic casework, focusing on the identification of biological fluids and the determination of species origin. Topics include the classical precipitin test and its underlying antigen-antibody precipitation reaction, lateral-flow immunochromatographic assays used for presumptive identification of blood, semen, and saliva, and enzyme-linked immunosorbent assay (ELISA) as a confirmatory platform. Questions probe the distinction between presumptive and confirmatory testing, the significance of antibody specificity and cross-reactivity, interpretation of test results in casework scenarios, and the evidentiary weight of each method. The test is grounded in internationally recognised forensic serology and immunology principles and is designed to assess applied understanding: interpreting results, recognising test limitations, and selecting the appropriate method for a given forensic question.