Typically speaking, using regular notebook paper and a single envelope, 4 to 5 sheets of paper can be mailed while staying under 1 ounce. The United States Postal Service charges one stamp per ounce...
Exculpatory Evidence: Typically used in criminal cases, this type of evidence is that which favors the defendant, either partially or totally removing their guilt in the case. In the United States, if the prosecutor or police have found evidence, it is their duty to disclose it to the defendant.
The ability of a piece of evidence to make a relevant disputed point more or less true. For example: In a trial of a defendant for murder, the defendant's dispute with his neighbor (unrelated to the crime) has a no probative value because it provides no relevant information to the trier of the fact.