Twenty-year-old Bryan Nevins, a resident at the Woods Services treatment home, was not deemed missing until a nurse looked for him to give him medication around 4 p.m. Saturday.
Nevins had returned with two other counselors and three other clients around noon from a brief trip to nearby Sesame Place in the suburb of Langhorne, Pa.
Woods Services said Tuesday that a second residential counselor who chaperoned clients on the trip has been suspended.
Officials previously announced the suspension of a counselor who served as the van driver.
Information from: Bucks County Courier Times, http://www.phillyburbs.com