DNA was extracted using standard organic methods and ethanol precipitation and then quantified by stained yield gels and slot blot techniques. Typical samples in the experiments were obtained from two sets of decalcified human bones recovered from fresh water after 3 to 5 years, blood in fabric, blood on metal, and the flap of a sealed envelope. Using a combination of sample dilution, Thiopropyl Sepharose beads, BSA, and additional Taq polymerase made it possible to overcome inhibition of the polymerase. Although this treatment was used with some success in the laboratory, the researchers caution that it does not work with every sample. 2 references and 1 figure