La. R. Sup. Ct. 9
Briefs sent through the mail shall be deemed timely filed if mailed on or before the due date. If the brief is received by mail on the first legal day following the expiration of the delay, there shall be a rebuttable presumption that it was timely filed. In all cases where the presumption does not apply, the timeliness of the mailing shall be shown only by an official United States postmark or by official receipt or certificate from the United States Postal Service, or bonafide commercial mail services such as Federal Express or United Parcel Service, made at the time of mailing which indicates the date thereof. Any other date stamp, such as a private commercial mail meter stamp, or label from an Automated Postal Center, shall not be used to establish timeliness.
Applications forwarded by private delivery or courier service shall be deemed timely filed only if received by the clerk on or before the last day of the delay for filing.
La. R. Sup. Ct. 9