The answer to this question depends on who is doing the tracking and under what circumstances. What you should be most concerned about is whether police are allowed to use GPS tracking devices to monitor your movements. There are two scenarios where this is likely to happen, the first is where police are tracking you as part of an investigation and the other would be from violating an Order of Protection.
This issue was recently taken all the way to the Supreme Court in U.S. v. Jones. In Jones, local police and FBI were investigating a drug trafficking operation in D.C. that ultimately led to a life sentence of Defendant Jones. Part of the investigation involved installing a GPS tracking device on Jones’s vehicle, which police monitored 24/7 for a month. This helped secure his conviction at trial, but on appeal the court held that it violated his Fourth Amendment right against unreasonable searches and seizures. The U.S. Supreme Court agreed, using the reasoning that the government invaded Jones personal property and conducted an extensive search that went beyond the bounds of the Forth Amendment. Ultimately, Jones’s conviction was reversed because he was originally convicted using this illegal evidence.