Public International Law is a system of law
Was hard to prohibit land mines but they are totally indiscriminate because only 1 hits a military
objective out of 10, and people don't die, they get handicapped.
Mines something that explodes automatically, if it is exploded when the operator makes it, then it is
not an indiscriminate weapon anymore.
Booby-traps may not be mines at all, they can be holes with sticks inside etc.
Latest convention on cluster munitions (2008) bombs which have several bomblets because they
are light, a lot of ammo doesn't explode, could be dangerous and is indiscriminate. The full
prohibition is for member states, the general prohibition for others because it is an
indiscriminate weapon (not to use in civilian areas, but can be used in military areas with no
civilians).
Multiple rocket artillery are not regulated as well, but since they're indiscriminate, you can't use
in civilian populated areas, so they are limited by their nature
annaabi.ee 
