psychology include forensic psychology as an area of expertise (Bersoff et al., 1997; Roesch,
Grisso, & Poythress, 1986).
Another major change has been the shift in the location of competency assessments. Roesch and
Golding (1980) argued that inpatient evaluation, which was the common practice until recently,
is unnecessary in all but perhaps a small percentage of cases as most determinations of
competency can easily be made on the basis of brief screening interviews (to be discussed later
in this chapter). Community-based settings, including jails and mental health centers (see
Fitzgerald, Peszke, & Goodwin, 1978; Melton, Weithorn, & Slobogin, 1985; Ogloff & Roesch,
1992; Roesch & Ogloff, 1996) appear to be increasingly used to conduct evaluations. In 1994,
Grisso and his colleagues published the results of a national survey they had conducted to
determine the organization of pretrial forensic evaluation services in the United States (Grisso,
Coccozza, Steadman, Fisher, & Greer, 1994). These researchers concluded that "the traditional
use of centrally located, inpatient facilities for obtaining pretrial evaluations survives in only a
minority of states, having been replaced by other models that employ various types of outpatient
approaches" (p. 388). One compelling reason for this shift is cost. Laben, Kashgarian, Nessa, and
Spencer (1977) estimated that the cost of the community based evaluations they conducted in
Tennessee was one-third the cost of the typical mental hospital evaluation (see also Fitzgerald,
Peszke, & Goodwin, 1978). In 1985, Winick estimated that in excess of $185 million is spent
each year on competency evaluation and treatment in the United States. He estimated that these
costs could currently be two to three times as high as they were in 1985 (Winick, 1996).
The widespread use of screening instruments would serve to lower these rising costs as the
majority of individuals, for whom incompetence is clearly not an issue, would be screened out.
Only those defendants whom the screening instrument has identified as potentially incompetent
would then be sent on for a more formal assessment of competence. Screening instruments can
be administered in outpatient settings as well as in local jails or courthouses, thereby also serving
to eliminate the unnecessary detention of clearly competent individuals.
Base rates for competency referrals (from 2% to 8% of felony arrests) and for incompetency
determinations (from 7% to 60%) vary widely across jurisdictions and evaluation settings
(Nicholson & Kugler, 1991; Skeem, Golding, Cohn & Berge, 1997). This occurs for a number of
reasons including variations in examiner training and use of forensically relevant evaluation
procedures (Skeem et al., 1997), the availability of pretrial mental health services, the nature of
the referral system, inadequate treatment services for the chronically mentally ill and a
criminalization of their conduct, and the extent to which judges scrutinize bona fide doubt about
a defendant's competency before granting evaluation petitions (Golding, 1992). Nevertheless, the
modal jurisdiction typically finds only 20% of those referred incompetent to proceed with their
trial. Precise data are not available, but conservatively, half of those found competent presented
little or no reason for doubting their competency and could have been detected by adequate
screening procedures. This is true in the United States as well as in other countries. Zapf and
Roesch (in press) investigated the rate of (in)competence in individuals remanded to an inpatient
setting for an assessment of fitness to stand trial in Canada. Their results indicate that only 11%
of the remands were unfit to stand trial and, further, that with the use of a brief screening
interview 82% of the remands could have been screened out at some earlier time as they were
clearly fit to stand trial (Zapf & Roesch, 1997). Many of the assessment procedures we describe