I am analyzing a rollover event with the subject Kenworth T270 configured as a tanker truck. The driver's safety belt was configured with an "IMMI Comfort Latch" shoulder belt tension reliever. It appears that this system is in violation of FMVSS 208 sections S7.4.2 and S7.4.5 due to the fact that there is no automatic release of the tension relieving device upon opening of the driver's door or release of the driver's buckle latch. In the subject accident, the inexperienced young driver, whoi had never driven a vehicle with a "Comfort Latch" safety belt tension relieving device, apparently just buckle the safety belt around him, unaware that the shoulder belt had excessive slack in it, due to a previous driver having set the "Comfort Latch". IN the rollover event he was ejected from the vehicle and was killed in the accident.