Rules and regulations

If you go to the US Postal Service Website, there's a list there of what things may not be mailed to various countries. Most of them are about what you'd expect. Most places have predictable, routine restrictions on explosives and weapons, coins and currency, various agricultural items, and occasionally also on media of a subversive or unduly lascivious nature. I'm curious who makes the call on the last type, but all those things are basically understandable.

This one, from the list of things one may not send to Togo, though, is a bit puzzling. What, really, would be the harm?

Weights and measures other than those of the decimal metric system.

Apparently, if someone you know in Togo needs a contraband tape measure in inches and feet, you'll have to get it there some other way.