The only way to entirely prevent herbicide resistance is not to use herbicides (no risk and no benefit). Kinda like banning antibiotics to prevent bacterial resistance. Sensible use of herbicides (or antibiotics) will slow resistance. As a point of fact, Dow AgroSciences has developed a new 2,4-D formulation that reduces volatility by 90%. The complaint is that farmers may illegally use another formulation and cause damage to neighbors crops. Its kinda like banning guns from sportsmen because criminals use guns to commit crimes, Some favor that approach, and some do not,