Dried bloodstains on cotton cloth were subjected to contamination with a variety of presumptive test, fingerprint enhancement and other reagents and materials that may be used at crime scenes or encountered in bloodstains submitted to the laboratory for serological examination. A number of treatments had detrimental or destructive effects on subsequent serological testing. No difficulty should be encountered in obtaining both serological results and fingerprint identification information from the same item of evidence if crime scene and laboratory personnel are aware of the potential problems. 10 tables, 23 references. (Author abstract modified)