It requires both expertise in autism related disabilities, and a strong working knowledge of Functional Analysis of Behavior. In general, the approach is to set rules regarding privacy and teach him the rules. The problem is that he may not be rewarded by doing so and be getting more from the reactions of peers and adults. It is best to have the team working with him focus on rules and ways to redirect him that are not going to get more attention. That program should be a part of a regular education program so that it will not further encourage his seeing himself as different in some way.
Autism is a recognized disability in Washington and other states.
However, specific programs such as provided by the State Department of Developmental Disabilities is based on the level of disability. Unfortunately the State does not have the ability to provide funding for everyone who may need some services. In some situations insurance companies, and local mental health agencies also provide services. For children, the laws that affect education are federal as well as state. Eligibility for specific school related services is based on need and should be part of the evaluation for eligibility as well as annual evaluations as part of the Individual Education Planning process.