However no single one-for-all glue was found that was optimal for all four substrates, but rather three different glues were required to optimally cover all four substrates. This would entail crime scene personnel to have to carry and correctly use three different glues (ST for polymer and tiles, OC for wood and U for plastic), which is not unreasonable. Indeed, even with the risk of misuse of the wrong glue by mistake, it would likely still result in reasonable results, except for OC or U on tiles and ST on wood.