In many states, mandatory reporting laws have been interpreted to apply to those who merely express "pedophile tendencies" under the "imminent threat" statutes. Reporting does not often lead to prosecution, but it can. It can also lead to civil action such as social services intervention or execution of restraining orders.
I cite Indiana case law "Kevin Brown vs Indiana c 2006". His biological child was taken from him and his same-aged wife because he called a radio show and admitted to being attracted to kids. He had already informed his wife and friends and even had written plans to ensure that he would never be in a situation he could even remotely be accused of abusing a kid. Nevertheless, his child was taken by "emergency order of protection", by a squad of armed officers. In order to ensure his child didn't end up in foster care, he had to move out of his house, after which they placed the child with his wife and issued a restraining order against him "ad litem".
He took the case to the Indiana supreme court and lost. The conclusion was that there was no obligation of protection of liberty for someone who was an admitted pedophile because he represented an "imminent threat" and he could be subject to civil action by social services or otherwise.
Additionally, in California, in "Jack McLelan vs California c2007" a pedophile loudly proclaimed his attraction to young girls. The district attorney of his area applied a restraining order, barring him from being less than 10 meters from a child, or 100 meters from anywhere children congregate. This ban actually legally prevented him from entering the court, since there was a daycare facility in the same building, though they chose not to prosecute him for coming to his own hearings. He opted to leave the state rather than fight the restriction.
Presumably, a similar argument could be made in some states to raid his house and seize his electronics to search for illegal material, based on the "imminent threat" argument, though I'm not aware of that having been attempted, though it wouldn't surprise me if it had and simply didn't reach the public airwaves, due to the lack of notoriety of the target.