Effects of common contaminants on blood group factors in medico-legal ground

Blood grouping reveals vital information regarding identification, in relation to crime investigation. The technique used for grouping needs to be valid and reliable irrespective of the condition of the collected sample. Stains contaminated with common agents like dust, rust, bacteria and detergent give inconclusive results by mixed agglutination method with passage of time. The results may be accepted with caution, as the opinion might be medico legally significant.