what positive development in the last several decades have led to fewer potential brain dead donors than in the past​

Improvements in the safety of transport vehicles and the fight against crime have allowed the number of people with brain death to be less and less over the past few decades.

Explanation:

Traffic accidents and exacerbated violence were two of the biggest promoters of brain deaths worldwide. Although there is still a long way to go to reduce these events even more, the last few decades have shown an efficient decrease in cases of brain death due to improvements in vehicle safety and in the fight against crime, which is the main promoter of violence.

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