First described are modified techniques using antibodies, lectins, and enzymes that forensic scientists have used to determine blood groups and enzyme types of various body fluid stains. Preliminary research indicates these methods are highly sensitive, particularly in developing prints on adhesive tapes and nonporous surfaces such as polythene, PVC, and metal foil. The paper also details the development of a reagent based on the well-established iodine development method that has been created to use on wallpaper and emulsion painted walls. The technique is particularly effective for revealing marks under a week old. The iodine solution has been used in 61 scenes of serious crime and recorded fingerprints in 33 percent of these scenes. Tables and 12 references.