Law enforcement was against ending prohibition too. Many layoffs would be necessary if we did legalized marijuana.
The drug argument is a red herring. Legalizing drugs will no more fix the violent crime problems surrounding drugs than legalizing alcohol solved the mob problem.
Put an ID chip in all the illegals in prison and deport them. Put scanners along the border so they can't get back. Win, Win. We're no longer spending our money on illegals in prison and the population is reduced.