What is the effect of an allegation not investigated by the police in nigeria? (Kindly answer with judicial authorities)

The law is that once a specific and precise defence is raised during

investigation, it is for the Police to investigate it and for the Prosecution to

disprove it. See: OKERE V. IGP (2021) and SHEHU V. STATE. In

the case of BAJULAIYE V. STATE ,

the Court held as follows:

"It is necessary for me to chastise the police in this judgment. A

criminal allegation or trial in all ramifications has to do with the

liberty of the subject. It was imperative for the police to have

investigated this matter but regrettably, they did not do this. I

wonder why and how the learned trial Judge did not notice this

lacuna at the trial".