It would be higher than that. From the information here, about half of them would not have any record of a previous sexual offence, and they would also not admit to having committed or describe any other sexual offences under, in most cases, conditions where they're very likely to disclose that—for example, during a polygraph examination or truly voluntary treatment. So this is somebody who comes for treatment from a mental health provider with no criminal justice sanctions attached and no reporting requirements. So these are situations where people have done child pornography and have been involved in largely treatment settings and have been asked if they have done anything else. About half of them say yes and about half of them say no.
On February 14th, 2011. See this statement in context.