Humanitarian law is essentially the ruleset that aims to regulate the conduct of the parties of any given war. It is ubiquitously effective, meaning adopted worldwide, seeking generally to restrict the effects of armed conflict by protecting lives of civilians and non-hostiles and by prohibiting and limiting the methods of warfare that combatants are allowed to use. 

When it comes to the Solomon Islands, there is no specific law clarifying human rights. However, as they were an active party in the Geneva Conventions of 1949, it is safe to assume that they stand with the international ideals of the conduct of warfare. Almost hand-in-hand with humanitarian law, but perhaps on a more concentrated level, are human rights. Often they are defined by nation, and are much more focused on what is due to the people rather than the restrictions placed on factions. The representation of human rights in Solomon Islands definitely exists, but not to the extent of the US for example. As a relatively young nation, they are still developmental in many respects. Granted, in their initial constitution, their definition of human rights was vague and unconvincing, but amendments that would come later would remedy this significantly. As a problematically corrupt nation, the representation for the top economic percentages of the citizens is notably higher, so the rights of the majority are overlooked to an unfortunate degree. Regardless, they exist constitutionally.