Amid Trump threats, what has the US’s ‘war on drugs’ achieved in 50 years?

Al Jazeera looks at how years of punitive measures cost billions, filled prisons and did little to curb violence.

Amid Trump threats, what has the US’s ‘war on drugs’ achieved in 50 years?
Al Jazeera looks at how years of punitive measures cost billions, filled prisons and did little to curb violence.