A KCSE examination supervisor at Olympic Secondary School in Kibra, was arrested on Monday after she allegedly opened the wrong examination papers unknowingly.
Kibra Deputy Commissioner Gideon Ombogi said the teacher opened the English Paper 2 exam instead of paper 1 while issuing out the tests.
He confirmed that the exam did not leak since the supervisor had not displayed the paper to the students.
She was taken to Kilimani Police Station for questioning.
The English Paper 1 test and Paper 2 were scheduled for morning and mid-morning respectively.