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In order to keep your son in placement the agency will have to establish that he is incompetent and unable to manage his own affairs. They will need to do this with a doctor's report after an evaluation stating his functional capacity. If you have any past medical evaluations describing his mental health status and functional ability that would be extremely helpful in trying to keep him out of a placement. The standard for determining someone is in need of placement as an adult is a pretty high burden for the state. State will need to show that he is unable to purchase and make food, purchase clothing, take care of medical needs and the basic finances. If you could participate in the placement hearing and be able to testify that he is able to do these things your chances of keeping him out of placement are good. In addition, your son, as an adult, will be entitled to representation by an attorney at these proceedings. If your son has a minimal level of functioning he should be able to remain out of placement.
I hope this information and advice is helpful and I wish you the best of luck.