You have to serve the officer personally (the attorney for plaintiff won't do), and service must be made by a licensed process server. They can't invade private property (such as the employer's premises), but experienced process servers have imaginative ways for finding people.
I often take cases other attorneys won't, so call me for a free consultation. My number is 727-712-3333, or you can view my website at www.TampaConsumerLawyer.com
Call up a process server in the county where the officer is located and discuss it with them; they should be able to help. Good luck!
To schedule a consultation, call my office at 407-965-5519. I am licensed to practice in Florida only. My answer does not create an attorney-client relationship, nor does it constitute legal advice. Proper legal advice can only be given after learning all circumstances and conducting a comprehensive examination, including being able to ask questions, and cannot be given just from reading one question on an Q&A board such as this.