instruction: Find the id and last name of the teacher that has the most detentions with detention type code 'AFTER'?
response: SELECT T1.teacher_id, T2.last_name FROM Detention AS T1 JOIN Teachers AS T2 ON T1.teacher_id = T2.teacher_id WHERE T1.detention_type_code = "AFTER" GROUP BY T1.teacher_id ORDER BY COUNT(*) DESC LIMIT 1