Repeated passage of feces into inappropriate places (e.g., clothing or floor) whether involuntary or intentional.
At least one such event a month for at least 3 months.
Chronological age is at least 4 years (or equivalent developmental level).
The behavior is not due exclusively to the direct physiological effects of a substance (e.g., laxatives) or a general medical condition except through a mechanism involving constipation.
Criteria summarized from:
American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders, fourth edition. Washington, DC: American Psychiatric Association.