You're not wrong, here's a list of countries that may execute you for possession of canabis;

Bahrain, Brunei Darussalam, Iran, the Republic of Korea, Malaysia, Myanmar, the Philippines, Qatar, Singapore, Sudan, Taiwan and the USA.

Something tells me the USA has executed far fewer prisoners over this charge, leading back to the point I had originally made.

Only 8 percent of the US prison population is housed in for profit prisons. For profit prisons might be an okay place to start, but the entire US prison system is terrible and absolutely needs reform. There are a myriad of other things that need to be changed, just as much.