But Mr Boinnet was quick to allay fears of police brutality, saying police officers are being armed to ensure they have the capacity to handle any eventuality.
Police, he said, are not buying equipment specifically to secure the elections or quell violence.
"We are not buying items for riot but also have to prepare for the worst,” he said.
“We don't want a similar situation like 2007 where we were accused of lacking the capacity.”
He said the police service has been preparing for the polls since June last year.
“Our focus is to deliver a safe and secure environment for Kenyans to exercise their democratic right,” Mr Boinnet said.
“We have leant our lessons and are now ready to tackle any riot.”
The Inspector-General's warning came as acting Interior Cabinet Secretary Fred Matiang'i put on notice politicians inciting and perpetrating violence.
Dr Matiang'i declared war on violence perpetrators and asked police to act firmly, saying "no one is above law".
A similar warning was issued by President Uhuru Kenyatta during the burial of Interior Cabinet Secretary Joseph Nkaissery in Kajiado on Saturday.