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.
In legal practice the term generally is used to describe two things: the presentation of sufficient evidence by a civil claimant to support the legal claim (a prima facie case), or a piece of evidence itself (prima facie evidence).