Hanging criminals only solution?

Lot of debate is going on whether death sentance is right solution. I agree with those argue in favour of NO death penalty. I suggest that these criminals should be used for new drugs trials. All along drug trials used to be done on volunteers who were paid for presenting themselves for studing the drug effects on various parameters which a very risky proposition. However they ready either to get cured by the new drug which promise to cure a particular disease or for the loor of the monetory reward. These persons can be auctioned to the companies who want to put them on clinical trials and give to them highest bidder. Proceeds may be given to the victim family. This way these criminals can be put to good use of the society and victims family can be taken care of better.
Deshpande