I believe that a drive serve is virtually impossible to execute legally. Do not confuse this with the flick serve (which IS possible to execute legally). I've had tons of arguments with people about this matter. Have you had the same experience? The problem with the drive serve is NOT that contact is above the waist. The primary problem with the drive serve is that the racket head is (almost?) always too high with respect to the serving HAND. From the wording and pictures in the rules, if you can't tell if the racket head is completely below the hand at contact on the serve then the serve is not legal. Check out the illustration at: http://www.intbadfed.org/laws.html#11. SERVICE The wording in Law 9 (Service) is as follows: (9.1) In a correct service: (9.1.6) the shaft of the server's racket at the instant of hitting the shuttle shall be pointing in a DOWNWARD direction to such an extent that the whole of the head of the racket is DISCERNABLY below the whole of the server's hand holding the racket (as in Diagram D). Note that it says that the 'shaft is pointing in a downward direction'. Also note the use of the phrase 'discernibly below'. In every drive serve that I've seen, the shaft of the racket is ALMOST horizontal at shuttle contact and is definitely NOT discernibly below the serving hand. In this situation you often cannot tell if the racket head is actually below the hand or not. However, from the wording of Law 9 & the diagram included, it should be obvious that it is not legal (if you can't tell).