Most jurisdictions recognize "per se" defamation, in which the allegations made by the defendant are presumed to cause damage to the plaintiff. Normally in personal injury litigation, including actions for defamation, the plaintiff bears the burden of proof. Within the context of defamation, that means that the plaintiff must establish by a preponderance of the evidence that the defendant's statements were false, and that the defendant knew or reasonably should have known them to be false at the time the statements were made. Defamation per se provides a significant exception to that rule: Typically, where the statements made by the defendant constitute defamation per se, the defendant has the burden of proving that the allegations are true.
Typically, the following may consititute defamation per se:
Allegations that an unmarried person is unchaste;
Allegations that a person is infected with a sexually transmitted disease;
Attacks on a person's professional character or standing;
Allegations that the person has committed a crime of moral turpitude
You are considering filing an action for defamation, you may wish to consider the following:
High Cost - Defamation actions tend to be costly to pursue. When brough against major media companies or publishers, or their employees, you should expect that the case will be capably defended by highly skilled defense attorneys.
Low Recovery - Defamation actions rarely result in sizeable awards of damages, and it is not unusual for the cost of pursuing a defamation action to exceed the ultimate recovery.
Publicity - The publicity associated with litigating a defamation claim can actually serve to expose a greater audience to the false allegations than they previously enjoyed. If a newspaper or news show picks up the story of the defamation lawsuit, defamatory statements previously known to only a handful of people can suddenly become known by the entire community - sometimes the entire nation or world. Sometimes the media will do a poor job of subsequently covering the verdict, such that the public hears the defamatory allegations but doesn't learn that the plaintiff was successful in the lawsuit.
Difficulty of Proving Defamation - It is sometimes not possible for a plaintiff to establish all of the elements of a defamation action, even where the defendant's statements were entirely false. Most people who hear that a plaintiff lost a defamation action aren't interested in the nuance - they will instead assume that the loss means that the allegations which inspired the suit were true.
The information provided above was from the link below
Defamation of Character