Owing mainly to the adulteration issue and reduced obtrusiveness of the collection process, alternative specimens (see Chapters 2 and 7-11) have been receiving increased attention. Among them, oral fluid appears most interesting because sample collection is easiest and testing can be performed on-site for a quick result. Moreover, because drug levels in oral fluid are more closely correlated with those in blood than those in urine, oral-fluid drug tests better measure the degree to which a donor is under the influence. This potential advantage aroused the interest of many police departments, and oral-fluid test devices are being evaluated in roadside drug testing (see Chapter 17).
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