Conversation so far:
What happened at the Capitol Hill intoxicated-driving accident with Patrick J. Kennedy?
Patrick J. Kennedy crashed his automobile into a barricade on Capitol Hill in Washington, D.C..According to Kennedy, he was disoriented from the prescription medications Ambien and Phenergan.
Did Patrick J. Kennedy have any passengers in the Capitol Hill intoxicated-driving accident?
Are there any other interesting aspects about Patrick J. Kennedy's Capitol Hill intoxicated-driving accident besides saying he was disoriented from prescription medications?
Anonymous sources are alleged to have seen Patrick J. Kennedy drinking at the nearby Hawk & Dove bar prior to the accident.
Did Patrick J. Kennedy go to rehab for the Capitol Hill intoxicated-driving accident?
Patrick J. Kennedy announced he would be readmitting himself to a drug-rehabilitation facility where he had sought treatment for prior addictions.

Question: When did he first go to rehab?
Self-contained rewrite: When did Patrick J. Kennedy first go to rehab?