(2 Mar 1997) Spanish/Nat The U-S decision to decertify Colombia for not co-operating fully in the fight against drugs is worrying those involved in legal Colombian exports. Some businesses fear the decertification could set the stage for possible U-S trade sanctions. Such a move would have a severe impact on Colombia's lucrative flower exporting business. Any U-S trade sanctions imposed on Colombia would badly hit Colombian flower growers, as well as workers in the industry in both Colombia and