Find the start and end dates of behavior incidents of students with last name "Fahey".
SELECT T1.date_incident_start ,  date_incident_end FROM Behavior_Incident AS T1 JOIN Students AS T2 ON T1.student_id  =  T2.student_id WHERE T2.last_name  =  "Fahey"
SELECT T1.date_incident_start ,  date_incident_end FROM Behavior_Incident AS T1 JOIN Students AS T2 ON T1.student_id  =  T2.student_id WHERE T2.last_name  =  "Fahey"
[{'date_incident_start': '2017-07-09 10:04:13', 'date_incident_end': '2018-03-08 14:08:54'}]