How about this: We legalize cocaine, but only cocaine manufactured on Mars. Investors (and engineers) will figure out the most economical way to get there, manu

How about this: We legalize cocaine, but only cocaine manufactured on Mars. Investors (and engineers) will figure out the most economical way to get there, manufacture the cocaine, and get it back to Earth. The side effect will be that we will have figured out economical interplanetary space travel.