While Smoke'n Ice is correct about only 7 slices of brisket (no burnt ends), no trimming for width after cooking and no puddling of sauces in the tray, the rule regarding application of sauce (within Rule 9) reads:
"Meats may be cooked with sauces and/or other liquids, but once the cooking is complete, sauces and/or liquids may not be added once put into tray. NO PUDDLING IN BOTTOM OF TRAY."
The full IBCA rules can be found here:
http://www.ibcabbq.org/rules.html