A hearing in the misdemeanor drug case against pop diva Whitney Houston that was originally scheduled to take place in Hilo, Hawaii, this coming Friday, March 1, has been postponed until March 7, reports the Associated Press. Prosecutors are reportedly requesting that Judge Joseph Florendo Jr. set aside a plea-bargain agreement based upon Houston's failure to submit a substance-abuse assessment, as had been required by the agreement. Houston, 37, was found with 15.2 grams of marijuana in her pocketbook at the Keahole Kona International Airport security checkpoint in January of 2000. She was not arrested, and prosecutors say that she abandoned the bag and boarded a flight to San Francisco with her husband, singer Bobby Brown, before police arrived. Last November, Houston entered a no-contest plea in the case and was ordered to pay $4,025. Judge Florendo agreed to dismiss the conviction, provided Houston stayed out of trouble and complied with the agreement.