Rep. Patrick J. Kennedy said yesterday that he is entering treatment for an addiction to prescription medications, an announcement that comes as police continue their investigation into a car crash involving the congressman near the Capitol. Calling his addiction a "chronic disease," Kennedy said he does not even recall the accident, which occurred early Thursday and raised questions about his behavior and how U.S. Capitol Police deal with members of Congress. The congressman's office has said Kennedy (D-R.I.) was disoriented behind the wheel because he had taken prescription medication to calm stomach inflammation and to help him sleep. No one...