Doping among masters athletes

or have several members of usms trained on doping control that attend the nationals so then rob you are saying only "younger" people that break world records should be tested? is there difference between shaving 0.01 off the WR vs say the 4+ seconds that was erased from the womens 50 free i witnessed? ie over 10%

or have several members of usms trained on doping control that attend the nationals so then rob you are saying only "younger" people that break world records should be tested? is there difference between shaving 0.01 off the WR vs say the 4+ seconds that was erased from the womens 50 free i witnessed? ie over 10%