It is evident that a more comprehensive comparison of swabs
(and collection devices in general) is required. We present the
results of a series of experiments designed to evaluate sampling
with, and DNA extraction from, a variety of swab types. Different
tip materials are compared through collection of three types
of biological material (two different quantities each of blood,
saliva, and touch deposits) from a variety of substrates, selected
to represent combinations of smooth/rough, porous/nonporous
surfaces. Swabs with similar-sized tips were chosen to allow
appropriate comparison among tip materials. Observations
regarding practicality of use in the field and the laboratory are
also made.