The Sheriff’s Office is sometimes unable to serve a suit at the address that has been provided and an investigation is required to first find your defendant, and then serve him with your papers. After the Sheriff’s Office has returned your suit as being unable to be served, then your attorney may request that the court appoint a private process server to locate and serve your defendant. It is best to appoint an agency rather than an individual, so that any investigator employed by the agency can make service of process.