SAN FRANCISCO / Court limits test used on released sex offenders / Judges say genital response measuring should be 'last resort'
When children or teenagers are identified as possibly deviant or offending, police or therapists often attempt to find out what kinds of stimuli sexually arouse them. Although interviewers may ask them directly, children facing the prospect of being labeled as sexually deviant are reluctant to answer honestly. Therefore, presumably objective means are often used: sexual interest tests, polygraphs, and/or plethysmographs.
Havenwyck Hospital in Auburn Hills, Michigan uses penile plethysmographs on juvenile sex offenders.
Link to Havenwyck Hospitals official site: http://havenwyckhospital.com/programs/residential-impulse-disorder-program/
My son spent 17 months of his childhood (age 11) in Havenwyck Hospitals Impulse Disorder Unit.