Process servers try to avoid situations where they end up having to draft an affidavit of non-service, as this can make a case more difficult to proceed with in court. Process servers are permitted to use a variety of techniques when tracking people down to serve legal papers, and sometimes it can take several weeks to successfully locate someone, especially if that person is actively attempting to avoid the process server. When the intended recipient avoids the process server, this can also be referred to as evading service. It is advisable for individuals to leave a forwarding address and work information when they move to avoid instances where a process server tries to reach them and fails, allowing court proceedings to move on without them. In the end, process servers ensure due process of law afforded under the United States Constitution.