There is a duty on the Police to investigate the whereabouts of a suspect who says he was elsewhere when a crime was committed. However, it is not in all cases that the prosecution would mandatorily need to conduct a separate investigation. Where the prosecution has proof that the defendant is raising the Alibi wrongfully and calls strong evidence in proof of same, there will not be any need for investigation. OLAIYA V. STATE [2010] ALL FWLR (PT.514) 1. AGU V. THE STATE (2018) HELAR; WISDOM V. THE STATE (2017) HELAR.