Subtle scales: An avenue for identification of prescription drug abuse

Prescription drug abuse and diversion behavior is sustained by overprescribing of abuse-liable substances. Individuals who intend to abuse or divert prescriptions can feign symptoms easily and effectively. Efforts to identify such faking behavior have been lacking because most drug abuse screening tools and self-reported symptom inventories are known to have poor sensitivities to faking. This paper makes the case for the potential of subtle scales in the identification of faking behavior. Subtlety in scale development is the degree to which the psychopathological meaning of an item can be determined in an a priori fashion. Scales containing subtle items, such as the Minnesota Multiphasic Personality Inventory and the Substance Abuse Subtle Screening Inventory, have traditionally shown only moderate sensitivity to faking due to the lack of a tailored and focused approach. This paper provides a guide for the development of a subtle scale that is tailored to a specific condition and using sound measurement theory, a theoretical framework, and knowledge derived from literature. The Accuracy of Knowledge framework proposed by Lanyon is presented along with its application to the development of a subtle scale. Further, specific recommendations have been provided for the various steps involved in the development of a subtle scale including item development, sample selection, item refinement, and scale scoring. Use of well-developed subtle scales can present opportunities to reduce overprescribing, over-diagnosis, and help in the early identification of abuse behavior for targeted interventions. We conclude by presenting opportunities, scope, and possible avenues for research within the cultural context of the United States.