Welcome to DER & Associates Professional Investigations, a Waverly, Iowa private investigator firm also serving the cities of Waterloo, Decorah, Mason City and Dubuque. Firm president and owner Darwin E Rittgers is a 20-year veteran of the Waverly police force who has been in business as a private investigator for over 11 years.
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A comprehensive list of private detectives and agencies offering professional investigation services in Waverly, IA. Read unbiased customer reviews and recommendations of local investigators.