My son just filed his return, but indicated that he could be claimed as a dependent. I provided all of his support as he has autism, can I still claim him as my dependent

my son is in a transition program from his high school which is teaching him work skills, learn how to cook, and ride the bus.  I support him with Room Board clothing etc. He lives in my house 12 months of the year, but he did receive a w2 and indicated that he can be claimed as a dependent. Has autism since birth.