Pakistan Afghanistan Border and USA Mexico Border

According to recent news stories a bulk of the weapons in mexico are smuggled in from the USA and bulk of drugs, around 90%, are smuggled from mexico to the USA.According to figures given by the International Boundary and Water Commission, USA Mexico border is 3169 Kms, which is mainly plain land and water with no mountaineous borders.Whereas Pakistan Afghanistan durand line is 2640 Kms, which is all mountaineous area.If USA cannot control drug and weapon smuggling from its border which is mainly plain land and having an effective satellite and patrolling and border agencies, how can USA expect Pakistan to control insurgency from its Afghanistan border ?Pakistan share a mountaneous border with Afghanistan, which is relatively impossible to mointor and control, while USA has it self failed to control the smuggling of weapons and drugs from its mexican border, even when having all the resources and technology.