To become a licensed private investigator in Iowa you will need to meet the following basic requirements: Not currently be a peace officer: sheriff's deputy, police officer, etc. Be at least 18 years old. Have no aggravated misdemeanor or felony convictions. Be of good moral character. More items... Become a Private Detective through Training and Certification in Iowa How to Become a Private Investigator https://privateinvestigatoredu.org How to Become a Private Investigator https://privateinvestigatoredu.org