Definitive experimental signatures of quantum spin liquid states can be challenging to identify: though several qualitative signatures exist, these typically are not sufficient to rule out other, more conventional low-temperature physics.  I will discuss why Raman scattering is a particularly promising probe to perform quantitative comparisons between theory and experiment in situations where local magnetic moments couple through exchange interactions with strong spin-orbit coupling, which can lead to spin Hamiltonians with a dominant “Kitaev-type” interaction.  In the context of a family of 3D materials with this property, I will review the potentially distinctive signatures of this type of spin-liquid physics.