CHAPTER FOUR –– THE BILL OF RIGHTS
Part 2—Rights and fundamental freedoms
50. Fair hearing.
(2) Every accused person has the right to a fair trial, which includes the right—
(n) not to be convicted for an act or omission that at the time it was committed or omitted was not—
(i) an offence in Kenya ; or
(ii) a crime under international law ;
EDIT.